You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to cancel my ticket due to family problems, could you help me out?

ASSISTANT: Sure, I will help you in flight ticket booking. May I know your name please?

USER: My name is Donald Williams.

ASSISTANT: I have searched online but I could not find your flight reservation to cancel it.

USER: No problem, thank you for checking.

ASSISTANT: Thank you.