You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I have sudden work, So I want to cancel my reservation.

ASSISTANT: Sure, may I know your name please.

USER: I am Samantha Smith.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thanks for choosing us.