Chance Bole and Kevin Riley
Chance will arrive in the morning. He'll get a kick out of old-school Atlantis and chat with people while he waits for his dad, although he'll be tempted to go looking on his own.
Kevin Riley will arrive mid afternoon. Since Jim is on the mission, someone else from Starfleet want to come get him? He'll also be chatty and flirty and ask for recommendations for a good pub.