When you are using one of the prebuilt templates it is just looping over the posted values form the form and using the name of the element for the label. If you want to customize how the message looks you will need to open up the webassist > email > template > yourfile.php and customize the message from here. You can drag and drop the values onto the page where you would like to see them by going to bindings > form data and selecting the form page. Whatever changes you make to this page and save will show up in the email message.
If you have any problems with any values not showing after doing it like this please post back and include copies of the form page and the template page in a zip archive.