The following schema will show how the bot logic within the platform works for standard replying to users.

If you enable the GDRP module, this is the first message all users receive on all channels.

Every bot always starts with the flow configured in the welcome intent. This flow is customisable in the dialog manager.  

After the user asks a question the intent model determines where the conversation goes next based on various parameters.

If you want to build a non-intent bot (click through bot) that doesn't use an intent model, you can create this bot within the welcome intent.