You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Christopher Thomas this side. The unexpected injury, the travelling authorities told that you are unfit to travel in flight with a suggestion of physician, so, I need to cancel my booking. Can you help me in cancelling?

ASSISTANT: Sure. Please give me a moment.

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation found under your name.

USER: Ok, it's alright. Thanks for your great service.

ASSISTANT: Most welcome.