what are the fares for flights serving a meal from boston to pittsburgh before noon on thursday 
return flights ;return #1 from  boston ;return #2 to pittsburgh ;return #3 before noon ;return #4 on  thursday ;return #5 that  serve a meal ;return fares for #6
['select', 'filter', 'filter', 'filter', 'filter', 'filter', 'project']