owlab.group
The development of complex chat bots, a long and complex process. Complex chat bots are developed by entire development teams. Because you need to know a lot, know how to work with databases, apply machine learning algorithms and so on. I would recommend you to contact Owlab, the company that developed the ChatBot - Red Bus https://owlab.group/case-studies/red-bus . They recently developed a chat bot for a large investment project. The chat bot has a huge number of different functions.