My group has just begun playing Dungeons and Dragons 3.5e and I feel as though some light role playing during NPC interaction would keep the party interested in the current campaign, since it is getting dull. However, whenever they speak to a townsperson/bartender/generic character, it always tends to be something very brief and then they continue on their way. The players never roleplay their characters or even acknowledge other player's characters either. Meta-gaming is also an issue with this group.
The party has to find an orc who stole a map from the nearby librarian. The players find the orc and then the conversation begins like this:
Player 1: "Did he steal the map?"
DM: "You will have to ask him"
Player 1: "I ask the orc if he stole the map"
After asking the group if they could roleplay some more the only answers I got were essentially "It doesn't add anything, why should we do it?", or "Nobody else is doing it, why should I?" Even if I try to give some kind of XP reward for roleplaying, there is no response.