Sittingly
Taking a booking is easy. Knowing whether tonight's 9pm party of eight fits, which of your tables it fits on, what the room still has free at 7:30, and what the four people who did not turn up on Saturday actually cost you is the rest of the job, and most restaurants do it from a paper book and a memory of the room. Sittingly starts with a free worksheet that puts numbers on it: the floor plan turned into covers, the sittings each table really turns once you allow for resetting it, and what a year of no shows takes off the top. The paid plan keeps what it sized, as one book across the phone, the website and the people who walk in.