You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Dennis Roberts.

ASSISTANT: Welcome to our travel agency, how may I aid you?

USER: My scheduled examination dates has been postponed, can you please help me with changing my recent reservation?

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Dennis, there is no reservation found with your name.

USER: That's ok, may be my brother might have changed my reservation.

ASSISTANT: That's fine, thank you for reaching us.

USER: You are welcome. Thank you for approaching us.