show me flights going from san francisco to pittsburgh first class on monday of leaving after 12 noon
O O O O O B-fromloc.city_name I-fromloc.city_name O B-toloc.city_name B-class_type I-class_type O B-depart_date.day_name O O B-depart_time.time_relative B-depart_time.time I-depart_time.time