Generally, if you make a dining reservation, you will get a car unless you specifically say you don't want one. It isn't a bad idea to have that as request on your reservation, though. It won't hurt.
For a party of three, you will more than likely have "hitchhickers" with you. We've been a party of three and had one guy in the far back seat. We've been a party of two and we've had the far back seat.