Envy tried to let that pass. Pipsqueak wouldn't be very happy with him if he got snarky with strangers.
"Define 'help'," Envy says. "I can't get you home, but I can give you some information that might let you get home." He tells them what the Nexus is and the usual warnings about eating or drinking anything you find lying around. "I'm rather new here too, so I don't know everything yet. Find an Ed Elric. They know more than me. That's actually not too hard around here."