Hello.
Hello, how can I be your helping hand today?
I just want to change my existing reservation, due to my appointment with my  family doctor has been postponed. Can you please help me?
Sure, I am glad to help you.
Thank you.
May I know your name to track the details?
Sure, my name is Robert Roberts.
Thanks for your name, please wait.
Sure.
Thank you for waiting, no reservation was found on your name to change.
Ok, thanks for your service.
Thank you for choosing us.