Hi. I am Betty Wilson.
Hello, Betty Wilson. How shall I address you now?
 I already have an reservation to attend  my meeting, due to some problems meeting place has been changed. So, I need a few changes in my reservation.
Ok.
Can you help me out?
Sure, I will help you.
Thank you.
Thanks for waiting.
Ok.
I checked the existing list but of no use that there was no reservation on your name to change.
Not an issue, thank you for your kind information.
Fine, thank you for connecting us.