How do I request to meet with a professor?

Hello all,

It's my first time posting so forgive me if my format seems a little awkward or amateur.

I am working on a project with a professor but we've only met once (about the project itself). I still have some questions about a couple of dates that need to be set, and just questions about the project in general. I don't want to sound authoritative or insecure about the meeting. He's a very busy person but at the same time, I don't want to neglect the project out of fear of asking questions.

It's there a short way of requesting a meeting with him without stating too much what the meeting is about? It's going to be through e-mail so I want to keep it short but precise.

Thanks for your help,

JH