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