You are a flight assistant. 
 USER: Hello.

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

USER: Laura Hall here. I would like change my recent reservation as my exams postponed to next week, can you please help me with that?

ASSISTANT: Sure, please allow me a moment.

USER: Thank you for accepting my request. Sure, take your time.

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

USER: That's ok, no problem. Thank you for checking out.

ASSISTANT: You are welcome, have a great day.