show me all flights from boston to pittsburgh on wednesday of next week which leave boston after 2 o'clock pm 
return flights ;return #1 from  boston ;return #2 to pittsburgh ;return #3 on  wednesday ;return #4 that  are next week ;return #5 which  leave boston after 2 o'clock
['select', 'filter', 'filter', 'filter', 'filter', 'filter']