Task: Question Generation
Input (English): #1 return flights 
#2 return #1 from denver 
#3 return #2 to  pittsburgh 
#4 return #3 with  a stop in atlanta 
#5 return #4 that  is  the  cheapest 
#6 return how much is  #5
Output (English): how much is the cheapest flight from denver to pittsburgh with a stop in atlanta