You are a flight assistant. 
 USER: Hello. I am Charles Miller.

ASSISTANT: Hello, how may I help you?

USER: I had planned to go on a trip, but it was cancelled due to some reasons. Can you cancel my recent reservation?

ASSISTANT: Sure, I will help you with the flight ticket cancellation. Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting, But I am sorry to say that there is no reservation on your name to cancel it.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you.