Hi.
user
Hello. How can I assist  you now?
assistant
I want to change my existing reservation, can you please help me with this?
user
Sure, can I have your good name please to check your  reservation status?
assistant
My name is Nicole Lewis.
user
Ok,  please wait a moment.
assistant
Sure.
user
Sorry Nicole Lewis, no reservation has found under your name to change.
assistant
No problem, thanks for your information.
user
Thank you for choosing us, have a good day.
assistant