You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: Due to sudden rainfall at my source, I want to cancel my recent reservation.

ASSISTANT: Sure, may I know your name?

USER: Sure, I am William Brown.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there was no reservation found on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you.