Hello.
user
Hello, how may I help you today?
assistant
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?
user
Sure, may I know your good name please?
assistant
I am Michael Lee.
user
Thanks for providing your name,  please wait for a moment.
assistant
Sure.
user
Thanks for waiting, no reservation found with your name to change.
assistant
That's fine. Thank you for your kind information.
user
Thanks for opting us, have a nice day.
assistant