You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Gary Harris. I have cancelled my trip to Las Vegas. Please help me by cancelling the flight ticket.

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

USER: Ok, I will wait.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: Not a problem, thank you.

ASSISTANT: You are welcome, have a nice day.