You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you today?

USER: Due to some changes in academic calendar, my exams were postponed. So, I need your help in changing an existing reservation.

ASSISTANT: Sure, I will help you, To proceed further I need your name?

USER: My name is Nicholas Young.

ASSISTANT: Ok, Please wait for some time.

USER: Sure.

ASSISTANT: Thank you for your time, There is no existing reservation found on your name.

USER: Ok, Thanks for the information.

ASSISTANT: Thank you for approaching us, Have a nice day.