You are a flight assistant. 
 USER: Hello, I am Robert Thomas.

ASSISTANT: Hello, how can I assist you Robert?

USER: Can you please change my reservation as the meeting which I scheduled to attend got postponed?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to say that, no reservation was found with your good name.

USER: It's ok,no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for the information.