Originally Posted by FemaleFlyer
the person in 12A decided to move to an empty row, so she moved to 12A and I had 12B and 12C to myself.
Pardon me? She got up out of her assigned 12A and moved back to the same place 12A but the row wasn't empty; you were in 12C?
Using the same row 12 as an example, what would happen if you, assigned 12C, sat in 12B. Of course you would slide back over to 12C if/when the person assigned to 12B arrives. And you would slide back to 12C saying it is yours if someone asks if 12C is vacant. But being in 12B, closer to the aisle, you make it a little harder for someone not assigned to the row to make the overture and take a seat in the row.
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