Trouble with Fulfillment response from Lambda for Lex V2 Bot

Question

Hello I am working on a pretty simple Lex V2 bot that recommends movies based off of the slot `genre` and the connected lambda function hitting an API and returning the top 5 in the genre.

In Lex:
One of my utterances is "Suggest a good {genre} movie".  When I type that in to test the bot, it responds with "Intent RecommendMovieIntent is fulfilled"

Output of Lex JSON:

**{
 "botAliasId": "TSTALIASID",
 "botId": "770QE6HMIH",
 "localeId": "en_US",
 "text": "Suggest a good horror movie",
 "sessionId": "221398301550540"
}

{
 "sessionState": {
  "dialogAction": {
   "type": "Close"
  },
  "intent": {
   "name": "RecommendMovieIntent",
   "slots": {
    "genre": {
     "value": {
      "originalValue": "horror",
      "interpretedValue": "Horror",
      "resolvedValues": [
       "Horror"
      ]
     }
    }
   },
   "state": "ReadyForFulfillment",
   "confirmationState": "None"
  },
  "sessionAttributes": {},
  "originatingRequestId": "ef5552bd-c4ad-43dd-a34c-ef6a134e42cf"
 },
 "interpretations": [
  {
   "nluConfidence": {
    "score": 1
   },
   "intent": {
    "name": "RecommendMovieIntent",
    "slots": {
     "genre": {
      "value": {
       "originalValue": "horror",
       "interpretedValue": "Horror",
       "resolvedValues": [
        "Horror"
       ]
      }
     }
    },
    "state": "ReadyForFulfillment",
    "confirmationState": "None"
   },
   "interpretationSource": "Lex"
  },
  {
   "intent": {
    "name": "FallbackIntent",
    "slots": {}
   },
   "interpretationSource": "Lex"
  }
 ],
 "sessionId": "221398301550540"
}**

And here is the response from my Lambda:

**Test Event Name
MovieRecommendationEvent

Response
{
  "sessionState": {
    "dialogAction": {
      "type": "Delegate"
    },
    "intent": {
      "confirmationState": "Confirmed",
      "name": "RecommendMovieIntent",
      "state": "ReadyForFulfillment"
    },
    "sessionAttributes": {}
  },
  "messages": [
    {
      "contentType": "PlainText",
      "content": "Here are some popular Horror movies: 
The OctoGames
The Exorcism of Hannah Stevenson
Deep Fear
Haunting of the Queen Mary
The Farm"
    }
  ],
  "requestAttributes": {}
}

Function Logs
START RequestId: f0f00b2d-e28f-411c-9060-913823e0e846 Version: $LATEST
[INFO]	2024-02-09T20:46:16.185Z	f0f00b2d-e28f-411c-9060-913823e0e846	Received genre: Horror
END RequestId: f0f00b2d-e28f-411c-9060-913823e0e846
REPORT RequestId: f0f00b2d-e28f-411c-9060-913823e0e846	Duration: 48.48 ms	Billed Duration: 49 ms	Memory Size: 128 MB	Max Memory Used: 50 MB

Request ID
f0f00b2d-e28f-411c-9060-913823e0e846**

Does anyone know why this may be happening?

Answer

When you use `Delegate` then the message you send from the lambda will not be used, instead it will use any pre-defined ones in your bot configuration (if any).

What you instead want to do is to set the `dialogAction` to `Close` and the `state` to `Fulfilled`

```
{
  "sessionState": {
    "dialogAction": {
      "type": "Close"
    },
    "intent": {
      "confirmationState": "Confirmed",
      "name": "RecommendMovieIntent",
      "state": "Fulfilled"
    },
    "sessionAttributes": {}
  },
  "messages": [
    {
      "contentType": "PlainText",
      "content": "Here are some popular Horror movies: 
The OctoGames
The Exorcism of Hannah Stevenson
Deep Fear
Haunting of the Queen Mary
The Farm"
    }
  ],
  "requestAttributes": {}
}
```

Trouble with Fulfillment response from Lambda for Lex V2 Bot

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