You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER:  I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please help me in changing my reservation?

ASSISTANT: Sure, I am glad to help you. May I know your name please?

USER: I am Jerry Taylor.

ASSISTANT: Ok, wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found on your name to change.

USER: That's ok, not a issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.