You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name?

USER: My name is William Jackson.

ASSISTANT: How can I assist you?

USER: I need your help to cancel my recent reservation.

ASSISTANT: OK, please give me minute and I will get back to you.

USER: Sure.

ASSISTANT: Sorry, there is no existing reservation found on your name.

USER: That's OK. Anyways, thank you for the information.

ASSISTANT: Have a nice day.