Task: Question Generation
Input (English): #1 return flights 
#2 return #1 from  pittsburgh 
#3 return #2 to san francisco 
#4 return #3 that  are on  first class 
#5 return #4 that  are round trip 
#6 return information on  #5
Output (English): information on first class round trip from pittsburgh to san francisco