I recently gave a friend a lift to a wedding of mutual friends. My DH couldn't make it and neither could hers. We arrived at the hotel the night before and I didn't see her again until I spotted her at the reception the next day. I waved to her and she vaguely waved back, but didn't come over and say speak or anything. I had no idea if she was wanting a lift back, and after hovering nearby for a while but being ignored while she chatted with other friends, I thought stuff it, I've got to get back, and left without her. Turned out she'd arranged a lift back from someone else anyway.