Hi. I am Janet King.
user
Hello, how can I help you?
assistant
I need to change my existing reservation as my exams got postponed, Can you please help me with that?
user
Sure, I am willing to help you.
assistant
Thank you.
user
Please wait a minute I will revert to you.
assistant
Sure.
user
Thank you for waiting, sorry to inform we didn't find any reservation on your name.
assistant
Ok, no problem. Thanks for your information.
user
Thank you for opting us, have a  nice day.
assistant