'The flowers were delivered on time and we're exactly what I ordered.'
'Flower arrangement looked just like the picture, I knew it was the one I ordered before looking at the card. Thank you for doing such a great job!'
'Excellent service. Card was exactly as requested. Those sending the arrangement commented on the message and how the arrangement was true to what was expected.'
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.