You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you now?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, I can help you in that.

USER: Ok.

ASSISTANT: May I know your good name please to track the details?

USER: I am Kathleen Harris.

ASSISTANT: Ok, Please wait for a while.

USER: Sure.

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

USER: That's ok, thank you.

ASSISTANT: Thanks for opting us, wish you a nice day.