Well, no, you cannot "work out the details." Sorry.
There is no way to transfer a hiking permit reservation, since the person who entered the lottery and registered as the trip leader, or any named alternate leader, is the ONLY person who can pick up the actual permit. (They ask for an ID.)
All you can do, and it is kind if you do it right away, is to log onto the recreation.gov site, and cancel your permit. They will then release that permit back to the system where it can be re-reserved by someone else.
And they hold the release time for up to 24 hours, so that you can't release it and have someone else grab it right away. Sorry it has to be this way, but after seeing the havoc caused by the hackers who gobbled up all the Half Dome permits last year, then scalped them on Craigslist, this is a far better method.
If you don't release your permit and you don't go in to pick it up by noon the day before, then it is declared a no-show, and becomes available to anyone walking in and requesting it.
Edited by Steve C (06/05/12 04:25 PM)