Determine if your acquaintance seems interested in you. Pay attention to your acquaintance's body language when you see each other. According to David Givens, an anthropologist specializing in nonverbal communication, in an article for dating site Match.com, lifted shoulders when responding to you and the person mirroring your movements can be signs that someone is genuinely interested in you. Other signs to consider include whether the person compliments or lightly touches you often.

Practice being confident before asking the person out. Confidence is a major attraction factor and can make all the difference in getting a "yes" for a date. Ask a close friend to help you practice asking someone out without being timid. Practice using direct eye contact, smiling and holding your head up, all signs of confidence.

Keep the "ask" casual. Ask the person out in a light manner so that it doesn't feel like a pressure situation. You could ask her if she wants to "hang out" at a new coffee shop or go hiking one Saturday with you. Be sure to consider an activity that you know your acquaintance would enjoy. If she says yes to going out, set a time right then and there to make sure the date happens.

Stay cool if your acquaintance turns you down. If he seems reluctant or flat out says no, remain casual and calm to avoid embarrassment. You can either continue conversing in your normal manner or make up an excuse to exit early, telling your acquaintance you'll see him next time. Don't let the rejection get you down. Consider the experience practice for the next time you meet someone you are interested in.