Hello,.
Hello. How can I aid you?
I am Carolyn Miller.
Ok.
I made a earlier reservation to attend a conference, due to some problems my conference it got postponed. Can you please change my reservation?
Sure, please wait for a while.
Sure.
Sorry, no reservation done on name of  Carolyn Miller.
Ok, no issue. Thank you.
Thank you for opting us, have a nice day.