Hi.
Hello, How can I serve you?
I rescheduled my holiday trip to visit white house, can you please help me in changing  my existing reservation?
Sure, I am perky to help you. May I know your good name to check your previous reservation?
My name is Angela Collins.
Please wait for a moment.
Ok.
Thank you for being patience. I am here to inform you that, there is no previous reservation available with your specified name.
Ok. Thank you for the information.
Thank you for availing us.