You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Betty Brown here.

ASSISTANT: Betty, how can I assist you today?

USER: I want to cancel my ticket due to snow storm in my place.

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Betty, no reservation is found.

USER: No problem, thank you.

ASSISTANT: You are welcome.