show me the itinerary for the connecting flight from dallas fort worth to san francisco that departs dallas fort worth at 1940
O O O O O O B-connect O O B-fromloc.city_name I-fromloc.city_name I-fromloc.city_name O B-toloc.city_name I-toloc.city_name O O B-fromloc.city_name I-fromloc.city_name I-fromloc.city_name O B-depart_time.time