Luke is a NPC that gives information of places indirectly to the player in a form of having a conversation with another NPC, Jeremy. They both share the same role in the game.
"Jim's Gym has a regulation sized Nonagon! Entering that nine-sided cage really gets the blood flowing."
"The Benjamin Club is pretty exlusive. I heard you need to be 'ballin' if you want to get in."
"Giovanni's Bakery is amazing. The pecan pie is magnificent."
"I heard the hardware store has a great deal on Chainsaws. I'll have to check it out."