Respect and honor should be your guideline in this. That which you do not allow for your wife to happen with other men, do not allow yourself to practice it with other women.

The Quran advised also women to watch for the tone of their voice not to be close to intimacy for people who have ill hearts morally will use it in a bad way.

So yes, being pleasant is a fine term between genders or if someone mentioned something funny yes people can laugh even being of other gender. But always put your heart and intention at check not to be loose and intimate in a way that would be not proper.