How to implement voice overs linked with buttons?

Hey guys, I'm new to unity and I really need help with a project that I've been working on. Watching some videos on YouTube, I've managed to implement a dialogue system in one of my scenes which displays the next dialogue in line when the button assigned to it pressed.

Problem is, I can't seem to find any videos or forums discussing how to implement voice overs attached with the button, so the dialogue being displayed is the dialogue being spoken.

Any and all help is appreciated. Even suggestions on alternate methods.

Thank you in advance.