How to read CSV file in rasa chatbot?. it is reading the file but not responding to any questions

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this is action.py file code the changes were done in nlu.yml, stories.yml, and other files. But the chatbot is not responding to the questions asked.

def run(self, dispatcher: CollectingDispatcher,
        tracker: Tracker,
        domain: Dict[Text, Any]) -> List[Dict[Text, Any]]:
    df = pd.read_csv(r'C:\Users\HP\Documents\database.csv')
    print(df)
    for i, j in df.iterrows():
        dispatcher.utter_message(text=(str(j['source']) + " " + str(j['target']) + " " + str(j['edge'])))
    
    return []