'Thank you so much!!!'
'Excellent service. Thank you very much indeed. Yes i will use your services when the need arises in the future'
'Thank you for putting the order together with such a short notice . We live in Arkansas and won't be able to see your work. Thanks again.'
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.