Dear Sir/Ma'am,
I have experience in creating messenger bot.
I will use the facebook APIs to build your chat bot on your own server.
These APIs can be used to build chatbots on websites and on facebook pages.
Will not use any third party services like "MANY CHATS", “Chat Fuel”, “BotStar”, etc.
Therefore No Active User Count or Message Sessions based billing.
I will create your personal server on AWS which will be free for 1 year.
Therefore free of cost chat bot for 1 year without any Active users limit.
I have built chat bots for 2 very reputed businesses.
You can check out my freelancer profile reviews on below link:
https://www.freelancer.com/u/nitinbagdi20
Please initiate chat so that we can discuss further.
Best Regards