You are a flight assistant. 
 USER: Hello.

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

USER: I want to change my reservation as my magic show event which I need to attend got postponed. Can you help me?

ASSISTANT: Sure, could I have your name please?

USER: I am Carol Phillips.

ASSISTANT: Ok, please allow me a moment.

USER: Sure, take your own time.

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

USER: Ok fine, thanks for information.

ASSISTANT: You are welcome, have a great day.