dialogue: YOU: give me the ball , two hats and your first born <eos> THEM: no deal <eos> YOU: the ball and two hats then <eos> THEM: i want the book and ball <eos> YOU: ok fine <eos> THEM: thx <eos> YOU: <selection>
output: item0=0 item1=3 item2=0 item0=1 item1=0 item2=1