You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to cancel my recent reservation, due to  personal issue. Can you please help me in cancelling my reservation?

ASSISTANT: May I know your name?

USER: Myself Donald Scott.

ASSISTANT: Sorry, no reservation found on your name to cancel.

USER: Its ok, no problem. Thank you for helping me.