Hello.
Hello. May I know your good name please?
 My name is Scott Allen.
How can I help you for today?
Actually my examination is postponed, so I need to change my existing reservation. Can you please help me to change the reservation?
Sure, please give me a second.
Ok.
Thanks for waiting. Sorry, there is no existing reservation on your name.
Its ok, thank you.
Thank you for choosing us. Have a good day.