Task: Question Generation
Input (English): #1 return flights 
#2 return #1 that  are nonstop 
#3 return #2 on  united 
#4 return #3 from  boston 
#5 return #4 to san francisco 
#6 return #5 departing around 5 in the evening
Output (English): please show me united nonstop flights between boston and san francisco departing around 5 in the evening