Hello.
Hello. How can I help you?
Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?
Sure, I am here to help you. Please share your name.
Barbara Moore here.
Ok, please wait a minute.
Sure.
Thank you for waiting, sorry  no reservation found on your name.
No problem, Thanks for the information.
Thank you for reaching us, have a good day.