I visit your main website and have a chat with the chat widget but no response from them (maybe they are sleeping and offline)

I wonder if this Anychat has any features that can support ai chatbot which utilize both knowledge base (from pdf and website) and from chatgpt, so that the chatbot can automatically response (if the real human are offline or sleeping) based on knowledge base of open gpt. If you have this feature, can you give me the URL for the demo ? I want to try chatting with the chatbot.

Thanks.