You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Patrick White here.

ASSISTANT: White, how can I assist you?

USER: I want to cancel my ticket due to dense fog.

ASSISTANT: Sure, I will do that for you. Please wait, let me check your reservation status.

USER: Ok.

ASSISTANT: White, no reservation found under your name in our database.

USER: It's ok, thank you.

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