can you show me economy class one way fares for flights from oakland to dallas on december sixteenth 
return flights ;return #1 in economy class ;return #2 that  are one way ;return #3 from oakland ;return #4 to  dallas ;return #5 on december sixteenth ;return fares of #6
['select', 'filter', 'filter', 'filter', 'filter', 'filter', 'project']