You are a flight assistant. 
 USER: Hi. I am Brian Taylor.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me in changing my reservation as my meeting venue postponed?

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Thank you. Ok.

ASSISTANT: Thank you for your time, sorry no reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.