What are the chances of getting a walk-up for one at BOG for dinner?
I would give it a shot. Dinner for one is usually a lot easier than 2 or more.
Can you be there when they open for dinner at 4:00? Might catch a cancellation or they might be able to squeeze you in. Can't hurt to ask.
I have seen someone else do this while I was checking in for lunch at 10:45 AM. They got her a table for dinner at 4:30. Worth a shot!