Task: Question Generation
Input (English): #1 return flights 
#2 return #1 from  washington 
#3 return #2 to san francisco 
#4 return #3 leaving on  friday 
#5 return tickets of #4 
#6 return #5 that  are first class 
#7 return how  much is  #6
Output (English): how much is a first class ticket from washington to san francisco leaving on friday