Task: Question Generation
Input (English): #1 return flights 
#2 return #1 from  washington 
#3 return #2 to denver 
#4 return #3 on  first  class  
#5 return tickets of #4 
#6 return cost of #5
Output (English): okay we're going from washington to denver first class ticket i'd like to know the cost of a first class ticket