You can send emails to the users using the Send Email node.
To - The email address of the recipient. You can use email ids or you can pass a dynamic value using mustache tags.
eg: You can use {{session.user.username}} for a chatbot user that is already logged in.
You can email to more than one email account by putting a comma between emails or using an array.
Subject - The subject of the email.
eg: {{session.user.firstName}} needs help.
Message - The body part of the email.
The body of the email can be configured in the content data or in the message box of the node. If both are populated in the node, the Content data will take preference and will be sent to the user in the email.
Template - You can choose the email template that you designed from the dropdown.
See How do I customize an email template? for designing an email template.