Oikos Greek yogurt is the best.
Lady, my hair color will process just fine if I go outside the salon. Who's stupid enough to believe their hair color won't take if they leave the building? Do you have magic air in there or something? No, you're afraid I'll leave without paying and not return. You know what? I'm semi-OK with that. You don't know me (although I've been a client here longer than you've been an employee). But to feed me some BS like that...Um, I'd be insulted if I weren't so amused. Tell me you couldn't think up a better line than that.