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