if someone cancels adr for 3 can I book for 4?

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So does anyone know how the tables sizes for adrs work at BOG?! If someone cancels an adr for 3 would it be at the same size as a table for 4? Meaning that whole table would open up and I could coordinate book it for four? Or does the system go by exact numbers of people openings? I'm going to book it regardless but should I chance it and choose to book for 3 and add one later if possible. Or should I choose 4 in the choice options hoping that the cancelation for allows me to choose to book for 4?