Task: Question Generation
Input (English): #1 return flights 
#2 return #1 from  denver 
#3 return #2 to atlanta 
#4 return tickets of #3 
#5 return price of #4 
#6 return #4 where #5 is the  lowest 
#7 return #4 that are coach class tickets 
#8 return #7 ,  #6
Output (English): i'd like a ticket on a plane from denver to atlanta i would like a coach class or lowest fare ticket