'I would like to thank Florist One for having the flowers I ordered delivered on time and they are beautiful.'
'the process was seamless. My daughter was delighted with the arrangement. So i had a win, win experience. Thank you'
'THANK YOU! The flower arrangement was perfect. Even better than the photos online. I cannot tell you how much this meant to me. I've previously purchased flowers online for a loved one who lost a child, and was horrified at the arrangement that was delivered. It left me with a fear that you have dispelled. Again, thank you so much for caring.'
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.