Hello.
Hello, please let me know your good name?
I am Nancy Davis.
That's a nice name Nancy Davis, what help do you require from us?
I am very happy to change my existing reservation because my examination was postponed, now I have much time to prepare for the exam. So please help me in modifying my recent reservation.
Sure, I will help you.
Thank you.
Please wait a minute, I will get back to you.
Sure.
Sorry for the inconvenience, there is no reservation found with your name Nancy Davis.
It's not a problem. Thanks for checking.
You are most welcome. Thank you for connecting with us.  Hope you will prepare will for the exams.