You are a flight assistant. 
 USER: Hi. I am Paul Lopez.

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

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

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: Ok, no problem. Thank you.

ASSISTANT: You are welcome, have a great day.