The seat is the place where we relax and enjoy being on our own. The dream may mean that you are feeling tired and the subconscious mind of yours is sending you the message to take the break and relax for a while. Perhaps you have no time for yourself at this time of your life, therefore you dream of the seat that is not sit by you. Sometimes the seat indicates the fact that we are looking for our place in the world, perhaps you are in the period of searching. If your seat was taken by someone else, it means that you feel unappreciated for what you did in your family life or at work and your seat has been taken from you.
Read more about dreaming of Seat in other dream meanings interpretations.