I had the same predicament with my first instructor. He flew King Air's part time and it seemed that flight instructing was not his priority any more. He would have to cancel all the time cause some trip he had to fly for the company. Then came cancelling for personal reasons, again and again. I tried to non-chalantly talk to him but he portrayed the attitude that if I didn't like what he was doing then I could find someone else. No problem with me, I did just that. I went to the Aero Club manager and told him that it just wasn't working out between us and he gladly recommended another instructor I could pick up training with. It was a great move, and I'm glad I made it sooner than later because I did not enjoy the time with my first instructor, cause he was a bit of a lazy a$$.