Hello.
user
Hello. How may I assist you?
assistant
I want to change my existing reservation, due to some health issue. Can you please help me out?
user
 To proceed further, can I have your name please?
assistant
My name is Stephen Mitchell.
user
Ok, please wait.
assistant
Sure.
user
Thanks for waiting, I have gone through the reservation list twice but could not find any reservation active under your name.
assistant
That's ok, thank you for checking.
user
Welcome Stephen Mitchell.
assistant