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 email template or in the message box of the node.
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.