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# 练习 2：查看对话流程
在本练习中，您可以查看在您的客户端应用程序和您在 [练习 1：使用模板创建聊天机器人](exercise-1.md) 中创建的 Amazon Lex V2 机器人之间发送的 JSON 结构。对话使用[RecognizeText](https://docs.aws.amazon.com/lexv2/latest/APIReference/API_runtime_RecognizeText.html)操作生成 JSON 结构。[RecognizeUtterance](https://docs.aws.amazon.com/lexv2/latest/APIReference/API_runtime_RecognizeUtterance.html)返回的信息与响应中的 HTTP 标头相同。
JSON 结构按对话的每个回合划分。一个*回合*是指来自客户端应用程序的请求和来自机器人的响应。
## 第 1 回合
在对话的第 1 回合，客户端应用程序会启动与您的机器人的对话。请求 URI 和正文均提供请求相关信息。
```
POST /bots/botId/botAliases/botAliasId/botLocales/localeId/sessions/sessionId/text HTTP/1.1
Content-type: application/json
{
"text": "I would like to order flowers"
}
```
+ URI 标识正在与客户端应用程序通信的机器人。它还包括由客户端应用程序生成的会话标识符，用于标识用户和机器人之间的特定对话。
+ 请求的正文包含用户在客户端应用程序中键入的文本。在这种情况下，只发送文本，但是您的应用程序可以发送其他信息，例如请求属性或会话状态。有关更多信息，请参阅 [RecognizeText](https://docs.aws.amazon.com/lexv2/latest/APIReference/API_runtime_RecognizeText.html) 操作。
根据 `text`，Amazon Lex V2 可以检测到用户订购鲜花的意图。Amazon Lex V2 选择一个意图的槽位（`FlowerType`）和该槽位的一个提示，然后向客户端应用程序发送以下响应。客户端向用户显示响应。
```
{
"interpretations": [
{
"intent": {
"confirmationState": "None",
"name": "OrderFlowers",
"slots": {
"FlowerType": null,
"PickupDate": null,
"PickupTime": null
},
"state": "InProgress"
},
"nluConfidence": {
"score": 0.95
}
},
{
"intent": {
"name": "FallbackIntent",
"slots": {}
}
}
],
"messages": [
{
"content": "What type of flowers would you like to order?",
"contentType": "PlainText"
}
],
"sessionId": "bf445a49-7165-4fcd-9a9c-a782493fba5c",
"sessionState": {
"dialogAction": {
"slotToElicit": "FlowerType",
"type": "ElicitSlot"
},
"intent": {
"confirmationState": "None",
"name": "OrderFlowers",
"slots": {
"FlowerType": null,
"PickupDate": null,
"PickupTime": null
},
"state": "InProgress"
},
"originatingRequestId": "9e8add70-4106-4a10-93f5-2ce2cb959e5f"
}
}
```
## 第 2 回合
在第 2 回合中，用户响应第 1 回合中 Amazon Lex V2 机器人的提示，为 `FlowerType` 槽位填充一个值。
```
{
"text": "1 dozen roses"
}
```
第 2 回合的响应显示 `FlowerType` 槽位已填满，并提供提示以引发下一个槽位值。
```
{
"interpretations": [
{
"intent": {
"confirmationState": "None",
"name": "OrderFlowers",
"slots": {
"FlowerType": {
"value": {
"interpretedValue": "dozen roses",
"originalValue": "dozen roses",
"resolvedValues": []
}
},
"PickupDate": null,
"PickupTime": null
},
"state": "InProgress"
},
"nluConfidence": {
"score": 0.98
}
},
{
"intent": {
"name": "FallbackIntent",
"slots": {}
}
}
],
"messages": [
{
"content": "What day do you want the dozen roses to be picked up?",
"contentType": "PlainText"
}
],
"sessionId": "bf445a49-7165-4fcd-9a9c-a782493fba5c",
"sessionState": {
"dialogAction": {
"slotToElicit": "PickupDate",
"type": "ElicitSlot"
},
"intent": {
"confirmationState": "None",
"name": "OrderFlowers",
"slots": {
"FlowerType": {
"value": {
"interpretedValue": "dozen roses",
"originalValue": "dozen roses",
"resolvedValues": []
}
},
"PickupDate": null,
"PickupTime": null
},
"state": "InProgress"
},
"originatingRequestId": "9e8add70-4106-4a10-93f5-2ce2cb959e5f"
}
}
```
## 第 3 回合
在第 3 回合中，用户响应第 2 回合中 Amazon Lex V2 机器人的提示，为 `PickupDate` 槽位填充一个值。
```
{
"text": "next monday"
}
```
第 3 回合的响应显示 `FlowerType` 和 `PickupDate` 槽位都已填满，并提供提示以引发最后一个槽位值。
```
{
"interpretations": [
{
"intent": {
"confirmationState": "None",
"name": "OrderFlowers",
"slots": {
"FlowerType": {
"value": {
"interpretedValue": "dozen roses",
"originalValue": "dozen roses",
"resolvedValues": []
}
},
"PickupDate": {
"value": {
"interpretedValue": "2022-12-28",
"originalValue": "next monday",
"resolvedValues": [
"2021-01-04"
]
}
},
"PickupTime": null
},
"state": "InProgress"
},
"nluConfidence": {
"score": 1.0
}
},
{
"intent": {
"name": "FallbackIntent",
"slots": {}
}
}
],
"messages": [
{
"content": "At what time do you want the 1 dozen roses to be picked up?",
"contentType": "PlainText"
}
],
"sessionId": "bf445a49-7165-4fcd-9a9c-a782493fba5c",
"sessionState": {
"dialogAction": {
"slotToElicit": "PickupTime",
"type": "ElicitSlot"
},
"intent": {
"confirmationState": "None",
"name": "OrderFlowers",
"slots": {
"FlowerType": {
"value": {
"interpretedValue": "dozen roses",
"originalValue": "dozen roses",
"resolvedValues": []
}
},
"PickupDate": {
"value": {
"interpretedValue": "2021-01-04",
"originalValue": "next monday",
"resolvedValues": [
"2021-01-04"
]
}
},
"PickupTime": null
},
"state": "InProgress"
},
"originatingRequestId": "9e8add70-4106-4a10-93f5-2ce2cb959e5f",
"sessionAttributes": {}
}
}
```
## 第 4 回合
在第 4 回合中，用户提供意图的最终槽位值，即提取鲜花的时间。
```
{
"text": "5 in the evening"
}
```
在响应中，Amazon Lex V2 向用户发送确认提示以确认订单是否正确。设置 `dialogAction` 为 `ConfirmIntent`，`confirmationState` 为 `None`。
```
{
"interpretations": [
{
"intent": {
"confirmationState": "None",
"name": "OrderFlowers",
"slots": {
"FlowerType": {
"value": {
"interpretedValue": "dozen roses",
"originalValue": "dozen roses",
"resolvedValues": []
}
},
"PickupDate": {
"value": {
"interpretedValue": "2021-01-04",
"originalValue": "next monday",
"resolvedValues": [
"2021-01-04"
]
}
},
"PickupTime": {
"value": {
"interpretedValue": "17:00",
"originalValue": "5 evening",
"resolvedValues": [
"17:00"
]
}
}
},
"state": "InProgress"
},
"nluConfidence": {
"score": 1.0
}
},
{
"intent": {
"name": "FallbackIntent",
"slots": {}
}
}
],
"messages": [
{
"content": "Okay, your dozen roses will be ready for pickup by 17:00 on 2021-01-04. Does this sound okay?",
"contentType": "PlainText"
}
],
"sessionId": "bf445a49-7165-4fcd-9a9c-a782493fba5c",
"sessionState": {
"dialogAction": {
"type": "ConfirmIntent"
},
"intent": {
"confirmationState": "None",
"name": "OrderFlowers",
"slots": {
"FlowerType": {
"value": {
"interpretedValue": "dozen roses",
"originalValue": "dozen roses",
"resolvedValues": []
}
},
"PickupDate": {
"value": {
"interpretedValue": "2021-01-04",
"originalValue": "next monday",
"resolvedValues": [
"2021-01-04"
]
}
},
"PickupTime": {
"value": {
"interpretedValue": "17:00",
"originalValue": "5 evening",
"resolvedValues": [
"17:00"
]
}
}
},
"state": "InProgress"
},
"originatingRequestId": "9e8add70-4106-4a10-93f5-2ce2cb959e5f"
}
}
```
## 第 5 回合
在最后一回合中，用户响应确认提示。
```
{
"text": "yes"
}
```
在该响应中，Amazon Lex V2 通过将 `confirmationState` 设置为 `Confirmed` 并将 `dialogAction` 设置为 close 来表示此意图已完成。所有槽位值均可供客户端应用程序使用。
```
{
"interpretations": [
{
"intent": {
"confirmationState": "Confirmed",
"name": "OrderFlowers",
"slots": {
"FlowerType": {
"value": {
"interpretedValue": "dozen roses",
"originalValue": "dozen roses",
"resolvedValues": []
}
},
"PickupDate": {
"value": {
"interpretedValue": "2021-01-04",
"originalValue": "next monday",
"resolvedValues": [
"2021-01-04"
]
}
},
"PickupTime": {
"value": {
"interpretedValue": "17:00",
"originalValue": "5 evening",
"resolvedValues": [
"17:00"
]
}
}
},
"state": "Fulfilled"
},
"nluConfidence": {
"score": 1.0
}
},
{
"intent": {
"name": "FallbackIntent",
"slots": {}
}
}
],
"messages": [
{
"content": "Thanks. ",
"contentType": "PlainText"
}
],
"sessionId": "bf445a49-7165-4fcd-9a9c-a782493fba5c",
"sessionState": {
"dialogAction": {
"type": "Close"
},
"intent": {
"confirmationState": "Confirmed",
"name": "OrderFlowers",
"slots": {
"FlowerType": {
"value": {
"interpretedValue": "dozen roses",
"originalValue": "dozen roses",
"resolvedValues": []
}
},
"PickupDate": {
"value": {
"interpretedValue": "2021-01-04",
"originalValue": "next monday",
"resolvedValues": [
"2021-01-04"
]
}
},
"PickupTime": {
"value": {
"interpretedValue": "17:00",
"originalValue": "5 evening",
"resolvedValues": [
"17:00"
]
}
}
},
"state": "Fulfilled"
},
"originatingRequestId": "9e8add70-4106-4a10-93f5-2ce2cb959e5f"
}
}
```