Hello.
user
Hello.
assistant
John Parker is my name.
user
How can I serve you?
assistant
I want to change my existing reservation for my health checkup in Atlanta, can you help me?
user
Sure. Please wait a  while.
assistant
Thank you for your positive response. Ok, I will be waiting for your reply.
user
Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.
assistant
Oh! That's very disappointing to hear from your side. Anyways, thank you for checking.
user
Thank you for opting us.
assistant
Most welcome.
user