Sam and Dean were stopping by Ellen's bar Harvell's Roadhouse for a quick drink, they had just gotten back from a hunting trip. You were talking to Jo about somethings and Jo notices Sam and Dean and waves them over, she introduced you to them

Jo:"Sam, Dean, this is (your name)." She puts her arm around you

Sam:"Hi." He smiles and waves

Dean:He just gives her a nod and takes a sip of beer