Show custom Text If variants price 0

Hello there,
https://www.moltenstore.com/products/the-ada-oval-yellow-gold-engagement-ring-cultured
Here is the product link with multiple variants. I just want to show a text(Book Now) where the variants price $0 only. Is that possible by custom coding? and the theme is Inspired - Fine Jewelry 3.0.0. In the attached screenshot there is a price of $0.

Hi,

Find Buy Now button`s code in the Templates file - product.liquid and use this:

{% if {{product.price}} > 0 %}

[existing Buy Now button code]

{% else %}

[Book Now button code]

{% endif %}

But what do you want to happen when customers click on Book Now?