You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: I need to cancel my reservation as I am unable to catch the flight on reserved dates. So please help me with that.

ASSISTANT: Sure, please provide your good name.

USER: Sure, myself William Davis.

ASSISTANT: When I checked in my data base there is no reservation found on your name to cancel it.

USER: Oh! It might be cancelled already. Thank you for your time.

ASSISTANT: Have a nice day. Most welcome.