Getting someone out of your booth is just as important as getting them into your booth. Too much time is wasted chewing the fat with attendees. Every minute on the show floor should be spent capturing leads. There is plenty of time later to close the sale. Unless, of course, you are at a selling show in which case you should give me a call at (773) 426-6353 so I can tell you how to handle selling situations.
Nevertheless, there is an art to gracefully and respectfully getting someone out of your booth so you can move onto the next attendee. This video goes over the footwork and what to say.