Hello.
Hello, how can I help you?
I would like to change my recent reservation, will you help me with that?
Sure, I am here to help you. May I know your name please?
Thank you for accepting my request, myself James Roberts.
Ok, please wait a minute.
Sure, I will wait.
Thank you for your time, sorry no reservation found on your name.
Ok, not an issue. Thank you for your information.
Thank you for reaching us, have a  nice day.