You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name?

USER: My name is Karen Roberts.

ASSISTANT: How can I help you now?

USER: I want to cancel my reservation due to cancel of client meeting.

ASSISTANT: Ok. Please wait for a moment, while I check for the reservation.

USER: Sure.

ASSISTANT: Thanks for waiting, Sorry there is no reservation found with your name.

USER: No problem, thanks for your service.

ASSISTANT: Thank you for visiting us, have a nice day ahead.