You are so kind – and I am kind and smart: Actor – Observer Differences in the Interpretation of On-going Behavior

Imagine a conversation with a stranger. You introduce yourself and listen to what the other person says about him-/herself. Afterwards you reflect on the encounter and since it was a generally positive interaction you arrive at the conclusion that the other person was a really charming person, kind and friendly; you also reflect on your own behavior and consider how well you presented yourself. Were you kind and friendly? And did you act in a competent or confident manner or did you maybe seem insecure or nervous? Again, since the interaction went well, you walk away thinking that you were confident and assertive. The other person might reflect on the interaction in a similar fashion and might come to the conclusion that he/she came across as smart and confident, and that you were kind and friendly. What was going on here? How did the same reflections on the same behavior lead to different interpretations of two people's actions?