Hi, I am Donna Nelson.
user
Hello. How may I abet you today?
assistant
I would like to change my existing reservation as my appointment with my doctor got postponed. Can you help me with it?
user
Sure, please give me some time I will check the reservation list.
assistant
Sure.
user
thanks for waiting, we did not found any reservation by this name.
assistant
It's ok, thank you for your response.
user
Thank for choosing us.
assistant