Please take a seat

I'll give mobile blogging a shot. It took forever to find a seat at Borders. I had to share a table with chatty teens. They were very friendly but too loud. I went as far as to ask a couple using two tables if they needed both. They said they did. That was awkward. Emily would have died of embarrassment had she been with me. I put on earbuds and music to block the girls' chatter. Finally a table opened up and I went for it. In just a minute a girl asked if she could share my table. Was it wrong to tell her I had waited a long time for a table of my own? I pointed to the table I came from and told her the girls there were very nice. They were. She's sitting with them. Then a man came to my table and pointed to the empty chair. I think he's asking if I need it. I shake my head no. He goes away. I realize he was asking to sit there. Doesn't everyone realize I need my Borders time my way? Can someone take the empty chair away before someone sits in it? Please?