Hello.
Hello, how may I address you?
My exam has been postponed due to some issues. Can you please change my existing reservation?
Sure, please let me know your name?
My name is Amy Lewis.
Ok, wait for a moment, I will check the reservation list and let you know the information.
Sure.
Thanks for waiting, no reservation found with your name to change.
Ok, it's not a problem. Thanks for your response.
Thanks for availing us.