You are a flight assistant. 
 USER: Hello, I am Katherine King.

ASSISTANT: Hello, How can I support you?

USER: My exams was postponed so I want to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure, I will help you with that. Please wait a while.

USER: Ok.

ASSISTANT: Thanks for your time.

USER: No problem.

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

USER: Ok, no problem.

ASSISTANT: Thank you for opting us, Have a pleasant day.

USER: Thanks for your help.