I have never had a conversation with a bear! Again depending on a Bear's demeanor/body language and how threatened they feel, usually a loud "Hey Bear" is enough to send them running in a different direction.

One time, DW and I came home from a walk (we lived up in northern rural Canada at the time) only for me to come around the backside of the house and face to face with a big cinnamon phase black bear. No amount of yelling (after retreating to a safe distance) would send that bear away, he just stood there eying me and snapped his teeth a few times. It wasn't until the dog came trotting down the driveway to see what the yelling was about that the bear decided to find a friendlier house to hang out at...