In the digital age, a prospective date could be a swipe or click away.
You can always get serious later-- it is much harder to slow things down. Ask your friends if they know anyone who might be interested in a casual date. But if you do not feel a connection with someone then you should feel free to move on. In addition to feeling good about yourself, you'll also want to take care of your hygiene and dress well so others know you're looking for a date. Simply saying, "I had a lot of fun the other night, but I think I'd like to stay friends," should be enough. Flirting is often viewed as a secret art form, but in reality it is pretty easy.