i would like the flights available from boston to denver arriving in denver on 9 o'clock wednesday morning on or by 9 o'clock wednesday morning 
return flights ;return #1 from boston ;return #2 that  are arriving in denver  ;return #3 on wednesday  ;return #4 by 9  o'clock  in the  morning ;return #5 that  are available
['select', 'filter', 'filter', 'filter', 'filter', 'filter']