Hello.
user
Hello. How may I help you?
assistant
I would like to do some changes in  my existing reservation, can you please help me out?
user
Sure, I will help you in booking. May I know your name to proceed further?
assistant
Sure, myself Alexander Hernandez.
user
Alexander Hernandez, regret to inform that there is no active reservation found under your name to amend.
assistant
That's ok, no problem. Thank you for the information.
user
Thank you for reaching us.
assistant