You might lower your voice to a murmur, and he would follow suit by whispering, or if you lean in, he might lean in as well. If he's not leaning in, then he may be sitting back in his chair, relaxed and engaged in what you're saying, which is a good sign. He may make an effort to touch you - whether it's paying a compliment about your earrings or noticing your manicure, of all things. It may seem he desires closeness with you, particularly if you're walking side by side, and he remains close. Generally, people don't like their personal space invaded by people who they dislike, so if you're both willing to be in close proximity to one another, it's a good sign. As the evening comes to a close, look for your date to try to extend the time you have together, whether it's suggesting coffee or a nightcap or just a few more minutes walking together. And a successful date may end with lingering looks as you say goodbye and references to the next time you're together.