'The flower arrangement exceeded my expectations. They were beautiful. Thank you.'
'Great job.Order placed and delivered in a timely manner.'
'She loved the flowers. She was moved to a new facility after i had placed the order and it was so simple to just have you switch the shipping address. That was such a wonderful surprise! 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.