Task: Question Generation
Input (English): #1 return flights  
#2 return #1 from dallas fort worth 
#3 return #2 to  boston 
#4 return #3 that  are leaving after 6pm 
#5 return departure times of #4 
#6 return #4 ,  #5
Output (English): list the flights and departure times for flights leaving dallas fort worth for boston after 6pm