Hello.
Hello, how may I address you?
 I made a reservation earlier this week to give a seminar, but my seminar has been postponed due to the client inconvenience. Change the reservation with the name of Elizabeth Williams, as my reservation was done with this name.
Sure, please wait a minute.
Ok, I will wait.
There is no reservation found with your name.
Ok, thank you for your information.
Thanks for availing us.