Here is a checklist of what you need to do in Evergage to create this play on your own site:
This play is based on the form abandoners so you will need to create a segment. Create a segment of people who have been on the 'demo form' page but have not seen the 'thank you' page.
Once the segment is built you can create a campaign based on that segment.
If you are going to have an email capture in the message or offer the option to view an online demo, then you can add an email capture form provided by your ESP. You should also make sure you are capturing the email in Evergage as it is submitted.
You can use a control group to understand the impact of the message on demo completions. Alternatively, you can omit the control group to drive as many people as possible through the final stage of the funnel.