Dear customer at work,
That's cool you're in the army, really. I'm proud of you. You're actually quite intelligent. But it's not cool to hit on me when I'm EXTREMELY BUSY and want to get my shit done so that I can get the hell out of there by a reasonable time. Also, no, you don't get free beer because you're in the army. And I don't often take IOUs, but I didn't want to seem like too much of a stiff, so you BETTER pay for that Dos Equis tomorrow. Stop flustering me, please. I really don't have time to flirt at work.