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 will help you with that changing reservation. May I know your name please?

USER: Myself Stephen Moore.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Sorry to tell you that, there is no reservation found on your name in our database to change it.

USER: That's fine, thank you.

ASSISTANT: Most welcome, thank you for contacting us.