You've moved them closer to being fervent and articulate fans. They are more likely to talk themselves closer to a sale and voluntarily tell others why they like your product. When you first meet that prospect, find the quality in them that you can most like and admire and keep it uppermost in your mind as you talk with them. You are more likely to bring out that aspect of their personality when they are around you and less likely to react to their behaviors that irritate or otherwise both you. When you stand opposite someone, you are more likely to literally oppose them.
Women instinctively continue to face each other or a man.
When siddling, people feel more comfortable with each other, themselves and their surrounding. They listen sooner, longer and are more likely to agree. Say your main points while turning, shaking hands, when they are reaching for something, demonstrating a product, pointing to something, when a part of the booth is in motion, etc. Involve motion to reinforce memory in exhibit demonstrations, staff gestures and walking, video vignettes, parts of the exhibit, etc. Answer with the direct reponse to their last comment rather than working up to your response with other background information that they may not want to hear until they feel heard.