There are lots of free chatbot building tools such as the one I run that offer the ability to setup a bot and connect it to facebook. You won’t require any coding knowledge, and you can sign up using your Facebook account. Once you’ve set up a free account you can start creating your chatbot. Make sure you keep these tips in mind when building your bot:
Think of a message thread as the place where you connect and interact with your users. Build just one bot, and your experience is available on all platforms where Messenger exists, including iOS, Android, and web. It also removes the friction of your users having to download one more app, on top of all the apps they already have and may not use, given Messenger is now used by 900 million people every month.
Chatbots are increasingly present in businesses and often are used to automate tasks that do not require skill-based talents. With customer service taking place via messaging apps as well as phone calls, there are growing numbers of use-cases where chatbot deployment gives organisations a clear return on investment. Call centre workers may be particularly at risk from AI-driven chatbots.
Since 2016 when Facebook allows businesses to deliver automated customer support, e-commerce guidance, content and interactive experiences through chatbots, a large variety of chatbots for Facebook Messenger platform were developed. In 2016, Russia-based Tochka Bank launched the world's first Facebook bot for a range of financial services, in particularly including a possibility of making payments.  In July 2016, Barclays Africa also launched a Facebook chatbot, making it the first bank to do so in Africa. 
Automated customer support with smart businesses chatbots. ActiveChat is an omnichannel chatbot platform for natural language customer support. Using this platform you can seamlessly integrate with CRM and CMS and make more sales with e-commerce integrations. “We provide you with everything you need to build great chatbots. Conversational design with Visual Bot Architect is easy as building with LEGO blocks”, claims ActiveChat.
Conversable is the enterprise-class, SaaS platform that will build your bot with you. They work with a lot of Fortune 500 companies (they’re behind the Whole Foods, Pizza Hut, 7-11, and Dunkin Donuts bots, among others). They go beyond Facebook Messenger, and will make sure your conversations are happening across all channels, including voice-based ones (like, for instance, OnStar).