'Flowers were pretty and were delivered to the church without any problems. Thank you!'
'Had a bouqet delivered to my best friends hotel on her one year wedding anniversary. The flowers arrived before they did and she said they were GORGEOUS.'
'I have not seen the flowers but I understand they are beautiful. Hopefully my friends will send me a picture of them soon. Thanks for helping brighten their day for me.'
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.