HelpHub has a way to add a large CTA for that as a fallback. E.g. our own HelpHub implementation has a _Message Us_ button in the bottom to trigger a chat with a human support agent.
However, we do love to use our products! Once logged in, you will see that we replaced the Intercom chat widget with HelpHub there. We still offer Intercom chat as a fallback if you need to talk to a human.
Without knowing that product well, I think the main difference is that HelpHub is not just a ChatBot. It's also a full in-app help center with semantic search etc. The ChatBot integrates with the rest of the features and among other things links you to the sources it used to generate the answers.