Lana is a prostitute who was hired by Sam Winchester.
In The Third Man, Soulless Sam hired a prostitute, and after spending the night with her, Sam began exercising.
Lana came out of the bathroom and was impressed with Sam's physique. Lana offered her phone number in case Sam wanted to call her outside of her shift.
Sam only pretended to be interested in her, and the minute she left, Sam scrunched up her card and threw it away.