Hello.
Hello, how may I assist you today?
I want to change my existing reservation, can you please help me with this?
Sure, may I know  your name for the changing  process?
I am Kimberly Anderson.
Sorry, as per your concern I can not amend your reservation, as your reservation is not found as per our records.
Ok, no problem. Thank you for your information.
Welcome, thank you for reaching us.