Crisp has built an incredible product regarding Live Chat. Especially for Wordpress. They offer a one-click integration thanks to their native wordpress plugin.
Regarding Chatbot, they've built a feature that lets you install a chatbot on your website with no coding skills.
You have 3 kinds of "blocs" that help you create your workflow : Event, Conditions and Action.
Based on these 3 blocks, you can build great conversations with no human interactions.