They are open from 11:30 a.m. - 12:30 a.m. (but you can only get drinks in the last hour). The menu is the same for lunch and dinner. Are you sure you can't make a reservation? Did you try calling the restaurant directly?
I couldn't make ADRs through the website but I don't even think we are going to try for reservations now. If we get there we get there. When we get there we get
there. I'm so used to HAVING to make a reservation to do anything is disney that this is kind of liberating