Don't give up. I am also going end of October and Touring Plans found me a reservation for the exact day and time I needed. I had at least two notifications that were taken before I could log into the system but the 3rd time I got it.
Touringplans reservation finder works like a charm. I was able to get 2 different reservations for BOG and other restaurants for our November trip. Just be ready to quickly book as soon as the text arrives. If you wait even a couple of minutes, it may be gone.