There is no one single interpretation for the meaning of a dream about favors. However, most dreams that feature favors are interpreted to be promising and exciting.
Some people believe that if they dream of a favor in their hand, it is as good as money in their pocket. This positive interpretation may come from the idea that in a dream you have power over your environment. So if you favor someone in your dreams, it is as if you are bestowing them with social status or an important relationship.
Others may associate favors with success or rewards because they are gifts given by the powerful. If someone bestows a favor on you in their dreams, it might be a sign that they mean to do something more significant for you later on down the road.