###HUMAN: show me all direct flights from DALLAS FORT WORTH to either SAN FRANCISCO or OAKLAND, ###ASSISTANT: SELECT DISTINCT flight.flight_id FROM airport_service AS AIRPORT_SERVICE_0, airport_service AS AIRPORT_SERVICE_1, airport_service AS AIRPORT_SERVICE_2, airport_service AS AIRPORT_SERVICE_3, city AS CITY_0, city AS CITY_1, city AS CITY_2, city AS CITY_3, flight WHERE ((CITY_0.city_code = AIRPORT_SERVICE_0.city_code AND CITY_0.city_name = 'DALLAS FORT WORTH' AND flight.from_airport = AIRPORT_SERVICE_0.airport_code) AND ((flight.to_airport = AIRPORT_SERVICE_2.airport_code AND CITY_2.city_code = AIRPORT_SERVICE_2.city_code AND CITY_2.city_name = 'SAN FRANCISCO') OR (flight.to_airport = AIRPORT_SERVICE_3.airport_code AND CITY_3.city_code = AIRPORT_SERVICE_3.city_code AND CITY_3.city_name = 'OAKLAND'))) AND flight.connections = 0