You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am William Evans, I have done my reservation long ago. But now my scheduled got cancelled. Can you please help me to cancel my reservation?

ASSISTANT: Sure, give me a minute. Sorry, there is no reservation found.

USER: Ok, fine. Thank you for the help.

ASSISTANT: Thank you for opting us.