Hello.
Hello,. How can I amend you today?
I am Rachel Thompson. Can you change my existing reservation as my exams got postponed?
Sure, we are here to aid you.
Thank you.
Please, wait I will check with the reservation and revert to you.
Sure.
Thanks for your time, we did not find any reservation with your name  Rachel Thompson in our data base.
Ok, Not an issue. Thank you for the information.
Thank you for availing us.