You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Stephen Anderson here. I want to cancel my ticket due to dense fog in my place.

ASSISTANT: Sure, I will help you with the flight ticket cancellation.

USER: Ok.

ASSISTANT: I have searched online but I could not find your flight reservation to cancel it.

USER: It's ok, thank you for checking.

ASSISTANT: Thanks for contacting us.