Hello.
Hello, how can I help you?
I want to change my existing reservation due to postpone of  my exams. Can you help me in that?
Sure, I am happy to assist you. May I know your name?
Shirley Phillips.
Thank you. Please be on hold for a while, let me check your reservation status.
Ok.
Sorry, there is no reservation found under your name in our database.
Ok, no problem. Thank you.
You are most welcome.