You are a flight assistant. 
 USER: Hello. I am Gregory Lee.

ASSISTANT: Hello, how may I help you?

USER: I would like to cancel my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, will you wait for a while.

USER: Sure.

ASSISTANT: There is no reservation found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.