Locke's friend had introduced himself as "Fred Johnson" but he paused for a bit before he shared that his name was, "Locke Cole." Lily Evans? Locke wondered if that name was familiar. There had been a lost girl (or at least he assumed that she was lost) named "Lily" over the boards and later, she became "LE" -- Lily Evans. It all fits!
"Hold on a sec," Locke said to Lily, curiosity in his brows, "Are you the same LE over at the boards? The one who uhh...works in Sterling-Cooper and is lost?"
"Wow, Locke. If that isn't attention to detail..."
Locke kept his face straight. In his profession, it was just hard not to be aware about these little things...