'Great service. Easy website to navigate. I am very impressed with the updates and information as to the status of my order. Thank you very much.'
'The flowers were beautiful. I did not order them until late the day before and they were delivered early to the church with my sentiments just as I requested. Thank you so much!'
You won't be able to dismiss this by usual means (escape or click button), but you can close it programatically based on user choices or actions.