Pay attention to eye contact:
Making good eye contact is essential as well.
It indicates you’re happy to be talking to that person, are comfortable and confident, with nothing much to hide.
However, if someone won’t meet our eye, it makes them seem a bit more shady (or it can simply send the message that you lack confidence.)
Also, try to be natural and don’t stare at the person, as they’ll feel uncomfortable and want to escape.