Task: Question Generation
Input (English): #1 return flights 
#2 return #1 between boston and philadelphia 
#3 return #2 that  arrive after 2 o'clock  
#4 return #3 that  arrive before 5 o'clock  
#5 return #4 on tuesday
Output (English): flights between boston and philadelphia that arrive after 2 o'clock and before 5 o'clock on tuesday