Thanks for the question! This seems to be a linear game, with six total slots: W T F, each having a morning and afternoon. Our players are J, K, L, N, O, and R.
We know that K and R are on the same day, and there’s one assistant per slot. We note this to the side.
L and O, on the other hand, cannot be on the same day. But now we know that the days will be some kind of combo of the following three people:
K+R J/N + L N/J + O
though we don’t know who’s in the morning vs afternoon yet. Now we’re told that N is in the afternoon, so at least one of L and O are in the morning.
Finally, we’re told that J must be before O, which means that J and O cannot be on the same day. That means N and O are on the same day, and J and L are on the same day. Now, knowing this, there are basically two possibilities (WTF order on horizontal axis) (you could split possibility two into two possibilities if you wanted):
Possibility 1: NO on Thursday Morn: J/L, O, R/K Afternoon: L/J, N, R/K
Possibility two: NO on Friday Morn: JL block / KR block, KR block / JL block, O Afternoon: LJ block / RK block, RK block / LJ block, N
Hope this helps! Feel free to ask any further questions that you might have.