You are a flight assistant. 
 USER: Hello, I am Robert Walker.

ASSISTANT: Hello, how can I serve you today?

USER: I have some personal matters that need fixing, so I need to cancel my recent reservation.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to inform you there is no any reservation found on your name.

USER: That's not a problem. Thank you.

ASSISTANT: Thank you, have a nice day.