'Thank you,good job'
'The flowers were fresh and beautiful and as described by my choice. I am very pleased with your service. Thank you for your professionalism!!!'
'Thank you for delivering the Peace Lily to the Funeral Home in a timely manner. My family member sent a picture of it and it was perfect! So many many thanks of giving me comfort and peace.'
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.