Would you like fries with that?

Sometimes, once in a while, I'm legitimately unhelpful. Not hostile, but unwilling to extend more help than a patron asks for. There is generally a reason for it, and the vast majority of the time, the patron in question is the reason.

For example:
If you, the reader, were to walk into the library, situate yourself in front of the catalog, loudly smacking your gum as you stare at the screen, obviously confused, and if, when I attempted to ask "Can I help you find something?" you only allowed me to say "Can" before you blurted out, hypothetically speaking, "Uh you not have Brother Odd b' Dean Koontz?," enunciating each syllable in a manner more staccato, more flouncy, and more indignant than the preceding, and if, when I tell you that yes, we do, then look at your screen and suggest looking for the title Brother Odd instead of the subject Brother Odd you, oh I don't know, let's say you insisted that "Uh already did!" despite the fact that the catalog very clearly says subject, then changed it to title, narrowed your eyes and smirked at me when it now shows up, then crestfallen, you realize it's checked out and ask if it's the only copy, if all of that should occur...

Then no, no I will not offer to put it on reserve for you. If you asked me to, I'd do it, but I'm not going to volunteer it. I know, I clearly have a bad attitude, but if you can't be nice to me even once during our entire exchange, it really kills my motivation to go out of my way for you. Ask any of the people for whom I do go above and beyond. You can tell who they are, because they're semi-regular here, and they look happy. They look happy because they know they'll leave either with what they came for, or with a promise that they'll have it soon. And they always get one of those options, even if it's not easy, because they treat me like a person.

On a side note, if you treat me like the hypothetical person in the beginning of the story, I have to assume you treat other service people that way as well. The knowledge that you have that sort of disdain for people, and that you treat people in a disrespectful manner like that tells me something you don't know about yourself. I think I should share it with you. Every time you go to (Insert Generic Megalithic Fast-Food Chain Here), you eat somebody's spit. Sorry, it's not mine, so there's nothing I can do about it. You know how you can put a stop to that? I'll give you three guesses.