You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I have your name please?

USER: I am David Davis.

ASSISTANT: What can I do for you?

USER: I want to cancel my reservation, due to my family tour trip got postponed.

ASSISTANT: Ok. Please wait a while.

USER: Sure.

ASSISTANT: We found a reservation on your name. Can I cancel it?

USER: Sure, you can proceed to cancel.

ASSISTANT: Your reservation has been cancelled.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.