Task: Question Decomposition
Input (English): question: what is the cheapest fare from dallas to denver round trip 
Output (English): #1 return flights 
#2 return #1 from  dallas 
#3 return #2 to denver 
#4 return #3 that  are round trip 
#5 return fares of #4 
#6 return #5 that  are the cheapest