I had been offered a position to work as a intern in one of my professor's lab. He had asked me if I would be interested. But the position was not confirmed. How do I ask him about the confirmation? Would it seem desperate? I really enjoy the course and would love to contribute to the work that is being undertaken.
Then ask him, either when you happen to meet in the corridor or a nice email - he may be waiting on you...
I don't think he will run around looking for you.
But think of the difference between "desperate" and "motivated" - he will be happy / pleased to find someone motivated !