Hi.
Hello, how can I assist you?
 I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please help me in changing my reservation?
Sure, I am here to help you.
Thank you.
May I know your name to proceed further?
I am Mary Miller.
Ok, please wait for a moment.
Sure.
Thank you for waiting, No reservation was found on your name to change it.
That's ok, not an issue. Thank you for checking.
Thank you for reaching us.