Editing notice after quotation

Hello,

I use the plugin “YITH WooCommerce Request a Quote” to replace my e-shop by a request for quotation. After sending the quotation there’s a notice saying “Your request has been sent successfully”. I’d like to edit this notice to write custom text inside of it.
As the notice has the css class “woocommerce-message” I guessed it would have to deal with WC instead of Yith and I searched for help but couldn’t find what I wanted.

If anyone has an idea please let me know so that I can try that on my side. Thanks !