Question swap with pot:

Sorry for the dumb question, I did try searching. I am trying to swap a 5 day for two 3 day trips in open time. I want both trips otherwise I don’t want the swap. Do I list the trips I want using the columns ie up and down or do I go across using the rows in the same line? Basically how do I make it so I will give me both trips? Sorry for the confusing question.