คําตอบที่เรียบง่าย

{
  "candidates": [
    {
      "first_simple": {
        "variants": [
          {
            "speech": "This is the first simple response.",
            "text": "This is the 1st simple response."
          }
        ]
      },
      "last_simple": {
        "variants": [
          {
            "speech": "This is the last simple response.",
            "text": "This is the last simple response."
          }
        ]
      }
    }
  ]
}

app.handle('Simple', conv => {
  conv.add(new Simple({
    speech: 'This is the first simple response.',
    text: 'This is the 1st simple response.'
  }));
  conv.add(new Simple({
    speech: 'This is the last simple response.',
    text: 'This is the last simple response.'
  }));
});

{
  "responseJson": {
    "session": {
      "id": "session_id",
      "params": {}
    },
    "prompt": {
      "override": false,
      "firstSimple": {
        "speech": "This is the first simple response.",
        "text": "This is the 1st simple response."
      },
      "lastSimple": {
        "speech": "This is the last simple response.",
        "text": "This is the last simple response."
      }
    }
  }
}