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