Fall Back / Default response is used when the bot is unable to find a relevant answer to the customer query , you can specify the fall back response from the "Setting" tab
Fall Back Response
Sending Email Alert
You can also alert agents by sending an email by configuring multiple email address separated by comma
You can also trigger webhook so that you can reply back with dynamic messages , if the trigger webhook is checked then default message will not send you need to give reply back to the webhook in JSON and that reply will be posted back to the user.