You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I am Jacob Campbell. My business meeting was postponed, so please change my existing reservation.

ASSISTANT: Sure, we are glad to help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found on your name in our database.

USER: No problem, thank you for your service.

ASSISTANT: Thank you for picking us.