Reply to message

{
  "type": "object",
  "required": [
    "message_id",
    "comment"
  ],
  "additionalProperties": false,
  "properties": {
    "message_id": {
      "type": "string",
      "description": "Id of the message to reply to."
    },
    "comment": {
      "type": "string",
      "description": "Reply body text."
    }
  }
}