如何重复Rasa机器人的最后一句话

actions:
  - repeat_last_message

from typing import Any, Text, Dict, List
from rasa_sdk import Action, Tracker
from rasa_sdk.executor import CollectingDispatcher

class RepeatLastMessage(Action):
    def name(self) -> Text:
        return "repeat_last_message"

    def run(self, dispatcher: CollectingDispatcher,
            tracker: Tracker,
            domain: Dict[Text, Any]) -> List[Dict[Text, Any]]:
        # 获取最后一条消息
        last_message = tracker.latest_message['text']
        # 发送最后一条消息
        dispatcher.utter_message(text=last_message)
        return []

## Repeat Last Message Story
* greet
  - utter_greet
* ask_question
  - utter_ask_question
* repeat_last_message
  - repeat_last_message