Natural speech in many different dialects. Pretend you are talking to a friend.
A:"Oh my god! That party last night was so, so awesome!"
B:"Dang, I wish I coulda been there. How was the food?"
A:"Eh, the food was so-so. Why couldn't you go?"
B:"I had to study for my final. Unfortunately, I can't make parties a priority."
A:"Bummer. Well, I hope you can make the next one."
Hello!
Some of the "slangy" parts are better suited to American English (eg. "dang", "bummer"), but I've tried to pronounce them in an Australian fashion. If you want a more "Australian" version, you'd need to replace the slang and rewrite the sentences a little.
Cheers!