Hi.
Hello.
I am Dorthy Thomas.
How can I assist you?
I want to change my existing my reservation due to postpone of my exams, so can you help me with this?
Ok, please wait I will check and revert you in a moment.
Sure.
 Sorry to inform you that no reservation was found on your name.
Not a problem, thank you for the information.
 Thank you for availing us.