Is this person interested in engaging in conversation?
Yes - They're facing you
Is this person interested in engaging in conversation?
Yes - They are facing each other
Is this person interested in engaging in conversation?
No - arms crossed
Is this person interested in engaging in conversation?
Yes - waving at you
Is this person interested in engaging in conversation?
No - they have their face down
Is this person interested in engaging in conversation?
No - They're face and body language is showing they're not ready to talk
Is this person interested in engaging in conversation?
No - They aren't looking at the speaker
Is this person interested in engaging in conversation?
Yes - They are smiling