You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to cancel my ticket due to family problems.

ASSISTANT: Sure, can I know your name please?

USER: My name is Gary Walker.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry Walker, there is no reservation found on your name.

USER: No problem, thank you.

ASSISTANT: Thank you for approaching us.