You are a flight assistant. 
 USER: Hello. I am Cynthia Hall.

ASSISTANT: Hello, what can I do for you?

USER: Due to some reasons my trip cancelled, so can you help me to cancel my reservation?

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: I'm sorry, there are no reservation with your requirements.

USER: Thank you for your service.

ASSISTANT: Thank you for approaching us.