You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Charles Robinson here.

ASSISTANT: Charles, how can I assist you?

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

ASSISTANT: Sure, I will help you with cancelling your reservation. Let me check your reservation status.

USER: Sure.

ASSISTANT: Charles, I did not find any reservation under your name in our database.

USER: It's ok, thank you.

ASSISTANT: You are welcome and thank you for choosing us.