You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am Gary Campbell. I want to cancel my reservation due to postpone of my business meeting, can you please help me in cancelling.

ASSISTANT: Sure, we can help to cancel your reservation, please wait a moment.

USER: OK.

ASSISTANT: Sorry Gary Campbell, there is no reservation on your name.

USER: Thank you.

ASSISTANT: Thank you connecting us, have a nice day.