This might out me as a psycopath, however, cut to the f'ing chase. If it is a transactional conversation don't insult my intelligence by pretending that it isn't. Obvioulsy this can create a problem as I tend towards "Do unto others as you would have them do unto you".
If something is within my means and the person hasn't made it onto my shit list I love to help out, it's what makes getting up in the morning worth while. Unfortunately we are all far more powerless than anyone can imagine and actually being able to do more than point people in the right direction, offer advice or just talk to someone is incredibly rare.