Offer them a beer! ;)
But if you want to find a language partner here - try going to community/language partners. I guess you want 'he/she speaks/english', 'he/she is learning chinese','from/australia' and probably tick 'native speaker', look through the list, and make a contact request.
Or perhaps see if any australians are asking questions in the chinese question area, and help them out by answering questions.