I can't think of the name of this game. I remember playing some game back in maybe 2006 or so. It was a first-person semi-futuristic game where you would walk around a hub world and talk to people who would give you contracts. Sometimes they were just to deliver some stuff to another NPC, while others took you into a little Quake III Arena clone to fight some bots. I think there might have been a trading system with changing prices on items. I know it was a PC game. Any ideas?

Pic unrelated