find a flight between denver and oakland the flight should be in the afternoon and arrive close to 5pm the flight should be nonstop 
return flights ;return #1 in afternoon ;return #2 that  arrive close to 5pm ;return #3 from  denver ;return #4 to oakland ;return #5 that  are  nonstop
['select', 'filter', 'filter', 'filter', 'filter', 'filter']