You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to change my reservation as exams postponed to some other dates, can you please help me out with that?

ASSISTANT: Sure, please share me your good name.

USER: Thank you. Myself Carolyn Baker.

ASSISTANT: Please standby.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you for opting us.