You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Due to postponed of my exam to other dates, so please help me to change my reservation.

ASSISTANT: Sure, can I have your name please?

USER: Sure, I am Carolyn Harris.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

USER: No issues, thank you.

ASSISTANT: Thank you for opting us.