Hello.
Hello, how may I help you?
My name is Jonathan Moore and I would like to change an existing  reservation. Can  you help me?
Sure, I am here to help you for this. May I know your name please?
Jonathan Moore.
Just a moment, let me check your reservation status in our database.
Sure, take your time.
Sorry for inconvenience, no reservation is found with your criteria.
No issue. Thank you for the information.
Thank you very much for approaching our agency.