dialogue: YOU: gimme book and hat <eos> THEM: no <eos> YOU: gimme book hat and 2 balls <eos> THEM: no <eos> YOU: gimme book and 2 balls <eos> THEM: ok <eos> YOU: <selection>
output: item0=1 item1=0 item2=2 item0=0 item1=1 item2=1