You are a flight assistant. 
 USER: Hi. I am Carol Phillips.

ASSISTANT: Hello, do you need any help from us?

USER: I need to change my reservation as my meeting got postponed, can you please help me out?

ASSISTANT: Sure, please allow me a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation with your name in our portal to make changes.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: You are welcome, have a great day.