Goes without saying that you won't end the dance with saying "thanks" and
walking away. You didn't come here to wiggle a little on the dance-floor:) But
you also won't let her do the same. After the song ends and she seems to be
willing to continue dancing with you, and unless she is a kino-girl (see "About
dancing"), just take her hand and lead her to the table of your choice,
somewhere where its relatively quiet and private. If it seems like she is about
to bail, take her hand and say / whisper in her ear something in the lines of "I
want to talk to you about something". Most probably she's gonna ask "about
what?", just reply "I'll tell you when we sit down". From here on you can choose
any of the strategies described in this guide.