is there a flight between philadelphia and denver that leaves philadelphia around 2 o'clock in the afternoon 
return flights ;return #1 from  philadelphia  ;return #2 to denver ;return #3 that leave philadelphia  around 2 o'clock in  the  afternoon ;return number of  #4 ;return if #5 is at least one
['select', 'filter', 'filter', 'filter', 'aggregate', 'boolean']