Hello.
Hello. How can I assist you now?
Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?
Sure, I am happy to  help you with that. Can I have your  good name please to check your  reservation  status?
Nancy Perez here.
Ok,  please wait a  moment.
Sure.
Sorry Nancy Perez, no reservation has found under your name to change.
No problem, Thanks for the information.
Thank you for choosing us, have a good day.