Hi, I am Sandra Williams.
Hello, how can I help you today?
 I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation.
Sure, I am here to help you. Please wait for a few minutes.
Sure.
Thank you for your time, There was no reservation found on your name.
No issue, thanks for your quick response.
Thank you for choosing us.