Task: Question Generation
Input (English): #1 return flights 
#2 return #1 from philadelphia 
#3 return #2 to  san francisco 
#4 return #3 that  are first class 
#5 return #4 on american 
#6 return #5 that  have a stop in dallas 
#7 return aircraft of #6 
#8 return type of #7
Output (English): i'm going to leave philadelphia and i want to go to san francisco and i want to fly first class american and i want a stop in dallas can you please tell me what type of aircraft you will be flying