Task: Question Decomposition
Input (English): question: is there a 4 o'clock flight from washington dc to denver 
Output (English): #1 return flights 
#2 return #1 from  washington dc 
#3 return #2 to denver 
#4 return #3 that are 4 o'clock flights 
#5 return number of  #4 
#6 return if #5 is at least one