Any competent guitar player should be able to work out chords for the melody if they had it, but it would be a bit of a challenge for anyone to deduce what the tune might be from a set of guitar chords!  If you have staff notation for the tune, there are plenty of people here who could make a midi and/or abc file out of it, so that others could hear what it sounds like.  I'll do it if nobody else offers.  If you like, send me an image file of the notation; malcolm_k_douglas@yahoo.co.uk