Task: Question Decomposition
Input (English): question: what is the cheapest way to travel round trip from milwaukee to san francisco 
Output (English): #1 return flights 
#2 return #1 from milwaukee 
#3 return #2 to  san francisco 
#4 return #3 that  are round trip 
#5 return price of #4 
#6 return #4 where #5 is  lowest