'Thank you very much...I was glad to hear that you got them there early...'
'Thanks for delivering the pink rose bouquet to my wife L. She loves them. And I thought the price was very reasonable. I will definately use you in the future'
'It would be nice if you included s photo if what was delivered so I could give an opinion'
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.