BookEnds, LLC reminds us that it's important to always query as a professional, and not like an old friend. Just because you've met an agent or editor in person doesn't mean they will remember you or the conversation that you had. Rather, query in a way that provides details to refresh their memory and maintain a professional tone. If you've invested the time, money, and courage to attend a conference and approach an agent or editor, you don't want to blow your chance to use this encounter in a query. Thou shall avoid any reason to be rejected in your query!