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