Accidentally deleted iMessage on phone - still on iMessages on computer, how to transfer?

I accidentally deleted an important iMessage conversation from my phone and need to get it back on my phone. My iPhone isn't backed up to my iTunes, however I used iMessage from my Air and the message and all of it's photo data is still there. Is there a way to transfer this back to my phone? My iCloud back up doesn't include messages due to carrier restrictions. Any help much appreciated!