Hi. I am Rebecca Green.
Hello. How can I aid you today?
 I made a reservation earlier to attend a get together party with my college friends. Due to some issues in college it  got postponed. Can you help me in changing an existing reservation?
Sure, please wait for a while.
Ok.
Sorry Rebecca Green, no reservation found on your name in our data list.
Ok, no problem.
Thank you for approaching us, have a nice day.