Hello, Can I reserve 2-3 lanes for a small group on a Saturday evening say 6:30 pm to 9 pm or is it first come first serve?

That's something you would want to call them about as there are leagues and whatnot on various days. The following comments will reinforce that you should call for something like this.

You can they did not have leagues on Saturdays i do believe

They do cosmic bowling Saturday nights.