People conversing in a casual setting.
The people are sitting at a cafe.
People sitting at a cafe doesn't mean that they are conversing.
exists e1 s1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_setting(x3) & a_casual(s1) & Theme(s1,x3) & Actor(e1,x2) & v_converse(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2.(n_people(x1) & at(e1,x2) & n_cafe(x2) & Actor(e1,x1) & v_sit(e1))