Implementing message node in lex

Hi, I have been looking at different bot builder where they have different node types as part of their bot flow. One of the node is of type "message" where you can just add that as part of the conversation.

So for if a user adds a message (sent by bot)) e.g. in between asking question using slots/enitities, how can we implement in lex.

Is that a new intent? Or do we need to create a lambda to handle it? Wondering what is the best way to handle it using lex. thanks.