Hello.
Hello. How may I assist you today?
I am Edward Turner want to change  my reservation due to prepone of my exams. Can you help me in changing?
Sure, please wait for a while, I will check the active reservation on your name and revert to you.
Ok.
Thank you for waiting, currently there is no active reservation found on your name.
Ok , no problem. Thank you for your response.
Thank you for reaching us, have a good day.