Hi. I am Elizabeth Hill.
user
Hello, how can I aid you today?
assistant
I want to reschedule my existing reservation as my appointment with doctor got postponed, so can you help me with changing my existing reservation?
user
Sure, I am happy to help you with your request. Please wait, first I need to check the status of your reservation.
assistant
Sure, take your time.
user
Sorry, we have not found any active reservation on your name with us.
assistant
  That's ok. Thank you for the information.
user
Thanks for consulting us, have a good day.
assistant