Hello.
user
Hello. How can I aid you?
assistant
I want to change my existing reservation, which is done recently. Can you please help me out?
user
Sure. May I know your name?
assistant
Thank you for considering my request. Myself Joseph Allen.
user
Give me  a minute.
assistant
Sure, take your own time.
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
Thant's ok, no problem. Thank you for your service.
user
Thank you  for  reaching us.
assistant