I barely know this girl who's really not hot but pretty cool. Anyways, I was sitting there thinking about asking her out...I knew it'd never happen but it was just a thought. 10 mins later she IMs me and asks if I still have my Econ book from last semester and I said I'll just give it to her (since I think the book isn't worth much and I never opened it in the first place). She said she'll take me to dinner and we figured out a place. I then told her she might wanna make sure that they're using the same book I have and told her which book I have, she said she'll check and the conversation ended. I don't know if she knows that we can check the books online or not, but I checked and they're not using the same book I have. So, I was thinking I should just tell her I'll pay for dinner if she doesn't want the book anymore or what should I do?