Hey @xiao​! Daniel from Customer Support Engineering here 🔧 

Currently, it is not possible for a Bot to take over a conversation from a teammate. Bots are useful for triaging issues, qualifying leads, and sending users apps and useful information before the conversation starts, but once a teammate has stepped in or the bot's path ends, the conversation is expected to be completed by human support.

Hope this is all clear! Let me know if you have any questions about this 😊