With the new Alexa skill builder, you can create a dialog model to reduce the amount of handling required in the skill endpoint (backend) to manage slot filling, prompts, and confirmations for a custom intent.

Delegate Dialog Directive Sample Project http://Alexa.design/skillbuildersample

Use the Skill Builder (Beta) to Define Intents, Slots, and Dialogs https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/ask-define-the-vui-with-gui

Dialog Interface Reference https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/dialog-interface-reference