Hello. Myself David Smith.
Hello, how can I assist you for today David Smith?
I would like to change my existing reservation, can you help me?
I am here to help you in Changing your reservation.
Thank you for accepting my request.
I regret to say this David Smith, there is no active reservation with your name to change.
That's ok, no problem. Thank you for the information.
You are welcome, thank you for reaching us. Hope you have a nice day ahead.