You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you help me in changing my existing reservation has my exam got postponed?

ASSISTANT: Sure, I'm here to help you in amending your reservation.

USER: Thank you.

ASSISTANT: Please provide me the name to check for the previous reservation status.

USER: I am Christine Carter.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Sorry, there is no active reservation have been found under your name in our database to amend it.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for reaching us.