Task: Question Generation
Input (English): #1 return flights 
#2 return #1 from  denver 
#3 return #2 to baltimore 
#4 return #2 to washington dc 
#5 return #3 or  #4 
#6 return #5 that  arrive before noon 
#7 return #5 that  arrive around noon 
#8 return #6 or  #7
Output (English): show me the flights from denver to baltimore or washington dc that arrive before or around noon