You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Brian White. I want to change my reservation due to my meeting has been postponed.

ASSISTANT: Sure, please wait for a moment, I will check and revert to you.

USER: Ok.

ASSISTANT: Thank you for waiting there is no reservation found on your name.

USER: Ok, thanks for information.

ASSISTANT: Thank you for availing with us.