Task: Question Generation
Input (English): #1 return flights 
#2 return #1 from boston 
#3 return #2 that  are arriving in denver  
#4 return #3 on wednesday  
#5 return #4 by 9  o'clock  in the  morning 
#6 return #5 that  are available
Output (English): i would like the flights available from boston to denver arriving in denver on 9 o'clock wednesday morning on or by 9 o'clock wednesday morning