Hello.
Hello, how may I help you today?
I made a reservation earlier to sign a contract for new project, due to some problems it has been postponed. Can you help me in changing my existing reservation?
Sure, may I know your good name please?
I am Michael Lee.
Thanks for providing your name,  please wait for a moment.
Sure.
Thanks for waiting, no reservation found with your name to change.
That's fine. Thank you for your kind information.
Thanks for opting us, have a nice day.