You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: David Thompson here. I want to cancel my ticket due to dense fog in my place.

ASSISTANT: Sure, will you please give me a moment?

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: No problem, thank you.

ASSISTANT: Welcome, have a great day.