Maybe try a Five Why's approach to getting him to tell you what he is looking to get out of it. If there's nothing in it for him, then you are literally wasting his time.
He may be a new manager, in which case, maybe point him to building trust with you, understanding your interests and career goals, and learning about others on the team. Those are all valuable for him, even if he doesn't know if yet.
Just realized I assumed gender so apologies to her if I was wrong.
