[Need help] Agent is generating unexciting links

Hello everyone, I'm currently creating my first bot for my publishing website. In the knowledge base, I've created a document with our products and links to the respective landing pages. One of our books isn't published yet and doesn't have a landing page. However, when I ask the bot about the book, it generates an invented link. It simply continues the logic (book title - link name). How do I stop such links from being invented?

Thanks in advance