Random voice responses

I have very little experience and knowledge about scripting but i would like to edit an existing smartapp so i can get responses in my native language (dutch). This is no problem, but i would also like to get random responses on the same action to keep things more natural. How can i achieve this in this piece of the existing script?

	case "Motion in room x":
		state.sound = [uri: "https://mymp3link.com", duration: "3"]
		break;