Hello Max.

With the default options of Amelia, this is not possible, but here is a workaround script that should work for the New Form 2.0.

You can edit what it says in the brackets ( 'Book This' ) and it is going to be shown instead of the actual time of the appointment.

Here is the script :

<script>
setInterval(function () {
jQuery('.am-advsc__slots-item__inner').html('Book This');
}, 1000)
</script>

A custom code needs to be applied to the page where the booking form is. Depending on what you're using (Gutenberg blocks, or some page builder), adding the CSS or JS can be done in a few different ways. 

If you need help with adding custom JS to the page, please take a look at this article.

Let me know if you try this out, and if you have any further questions about everything we covered.