You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name please?

USER: My name is Nicholas Allen.

ASSISTANT: How can I help you?

USER: My holiday vocation has been postponed.So, I need your help in cancelling my existing reservation.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found.

USER: Thank you for the information.

ASSISTANT: Want to have any more information please?

USER: No, that's is all I needed.

ASSISTANT: OK, thank you. Have a nice day.

USER: Thank you.