Hello.
Hello, how can I assist you now?
Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?
Sure, I will help you with that.  Can I have your  good name please to check your reservation status?
Margaret Jones.
Ok,  please wait a  moment.
Ok, I will wait.
Sorry Margaret Jones, no reservation has found under your name to change.
Anyway, thanks for the information.
Thank you for choosing us, have a good day.