My guess for the perfect answer is they are all the same person but you said three people so that cant be.
I would take the dream lover becasue...
The old lady who is about to die is: about to die so me giving her a ride wont change anything, probably pretty mean since her kids or grandkids aren't helping her and thus doesnt deserve my help, and why does she deserve a ride more than my dream lover, I dont think my dream lover likes being in the rain anymore than she does
The old friend who once saved my life: if he were in fact my friend would gladly pass up the ride to I could be with my dream lover, saved my life for this very thing-- that is to live and what makes you more alive than to be with your dream lover,