Hi.
Hello, how can I help you?
I am Sandra Mitchell. I already have an reservation to attend a  meeting, due to some problems meeting place has been changed.
Ok.
So I need a few changes in my reservation. Will you do it?
Sure, I will modify your reservation as on your request.
Thank you.
Give me a minute, let me check the reservation list.
Take your time.
Sorry, we could not find your reservation in our database.
Not a issue.
Hope we serve you next time.