Facebook Marketplace Auto Replying Chat bot

I am currently looking for help building an auto-replying chat bot for Facebook Marketplace. It should be able to reply on Facebook Messenger, although I do not have a specific script, I do have some ideas about what it should say. The primary goal of the auto-replying chat bot is to provide general information. If you have experience building chat bots and are interested in helping me create one, please get in touch.