You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name please?

USER: Sure, my name is William Brown.

ASSISTANT: Ok Brown, what can I do for you?

USER: My business trip has been postponed.Can you please help me for cancelling the recent reservation?

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: Please wait a moment. I will check for the existing reservation.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no reservation found with your name.

USER: Ok, It's fine.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.