A chair in a dream can point to status -- who holds a position of authority, or who's missing from one. An empty chair often reflects someone absent from your life whose presence you still feel, while sitting and waiting in one can mirror a decision you're putting off making.
Give not judgment before thou knowest the intention of the querent; for many ask they know not what, nor can they express what they intend. - William Lilly (1602.-1681.)