Add an AI Chatbot to My Website (Small Project)

I have a website and want to add an AI-powered chatbot that answers common visitor questions in natural language. The site is already built — this is a focused addition, not a rebuild. What I need: A clean chat widget added to the site (bottom-corner popup style), matching the existing look... (Budget: $2 - $8 USD, Jobs: Android, Debugging, HTML5, iOS, JavaScript, Mobile App Development, Performance Tuning, React Native)