If I can't find something on the website and have to resort to talking to someone, then whatever resources the chatbot has available should be accessible to me on the website directly.
Chatbot is functionally an interactive search box and I should be able to use a search box with identical results.
I prefer self-service websites with the option to talk to a human. Chatbots deliver negative value to me in many situations.
That being said, there are situations where I would implement a chatbot. For example, I offer a service where we don't care what the prospect's problem is since we can solve it. The prospect, however, does not trust us enough to be able to do this and so they want to talk to someone to be reassured that what we claim is indeed true.
For that, I can definitely implement a chatbot. If the inquiry could normally be handled by an outside call center who has no special access, that can be relegated to a chatbot. Everything else should be handled by a human with sufficient access to resolve the matter.
Thus, we need additional reassurance when prospects don't trust us enough and so a better approach is to invest in trust building so they feel that booking an appointment online is more convenient.