You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I am Nicole Jackson.

ASSISTANT: Ok.

USER: I want to change my reservation due to prepone of my exam.

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: Thank you for your help and information.

ASSISTANT: Thank you for choosing us.