You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me in changing my reservation as my event got postponed?

ASSISTANT: May I know your name?

USER: Myself George Evans.

ASSISTANT: Please wait.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

USER: That's ok, no problem. Thank you for checking out.

ASSISTANT: Thank you for reaching us.