Hi! I was stuck on this level for three days and was wondering why some of the people would not fit in the proper colors.  The problem is that you must wait until almost all the people are in line, use the podium and flo to keep them happy.  Then make sure when you seat them in the uncolored seats to seat them according to all colors....purple, green and yellow (those are the only three colors involved).  Make sure you have enough combinations of these three colors on the tables and the counter......it's almost like chess.  You have to study the colors.  Eventually if you get the patterns correct the people will seat in their correct colors in the correct order.  Hope this helps.  It took me a while to figure it out!!!!  Good luck!!!!