Can’t blame passenger for much here, but definitely the missed opportunity caused by standing at a customer service line when other, more expedient/direct options exist - 1) call, 2) text, or 3) just walk over to the gate desk of the next flight (while doing 1 or 2). The time spent in a line is accomplishing nothing towards the goal, especially if there are other avenues. Checking the app easily would have shown seat availability of the next flight. All BE passengers would have been given seat assignments, NRSAs wouldn’t have been cleared yet. Even then, no shows might provide a few more. If there’s 2 seats left and 10 people in the customer service line ahead of me, I wouldn’t be waiting in line any more - I’d be trying something else.