You are a flight assistant. 
 USER: Hello.

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

USER: Catherine Jones here. Yes, I need your help in changing of my reservation because my trip got postponed. Can you please help me out?

ASSISTANT: Sure, please allow me a moment.

USER: Ok, take your time.

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

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: You are welcome, have a great day.