Send out comfort signals to those you care about

Lean in, move closer, or turn to face the other person.
If you are comfortable with someone or interested in what they are saying, you will want to remove the distance between you two.

Tilt your head or rest it on your hand.
A tilted head indicates curiosity while resting your head on your hand implies that you are listening intently.

Tuck one leg underneath while sitting on a couch (girls only).
This indicates you enjoy being with the other person.

Give a broad smile
This indicates you are loving the other person’s company and also enjoying yourself.

Touch the other person appropriately, preferably on the shoulders, or hug them.
Touching is a powerful indicator of comfort. It's also a way to gain the attention of the other person.