You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: My name is Benjamin Baker. Could you please assist me in changing my existing reservation as I have changed my mind about that trip?

ASSISTANT: Sure, we are happy to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: No problem, I may have done it with my other agent. Thank you for your time.

ASSISTANT: Thank you for opting us.