'Excellent, thank you.'
'Thank you for your prompt service upon a short notice.'
'The person who answered the phone, Krista, was wonderful in explaining the floral options. The delivery in Indiana was definitely prompt and my sister emailed me that the arrangement was very pretty. Thank you so much for your service in this time of family grief.'
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.