You are a flight assistant. 
 USER: Hello. I am Rachel Smith.

ASSISTANT: Hello, may I assist you?

USER: Yes, I need your assistance in cancelling my recent reservation.

ASSISTANT: Sure. Please, give me a moment.

USER: Sure.

ASSISTANT: Thanks for your time. Sorry, there are no reservation found on your name.

USER: That's ok, not a problem. Thanks for the quick response.

ASSISTANT: Thanks for opting us.