Radio Advert Ideas

I've come up with the final idea for my radio advert, I decided that it would be good to have a voice over speaking along with some dialogue from a character. 

First ideas for my script-

Sound effects of the lid of Waikiki opening,

Diagetic sound of drink,
A girl says 'wow! what is this drink?
I'ts called Waikiki!
Wow! it tastes amazing!
VOICE OVER-
Waikiki. Available in 3 flavors, must be 18 and over, drink responsibly'