I must admit that I was not overwhelmed with the response I received from the 4 operators in the Sydney area I contacted either. Only one reply - which arrived after 4 weeks - answering questions which were not in my email (but which I had already read on their website) and failed to answer those that were.
But yes, they did offer an accompanied flight over the Sydney Harbour area...
I did have a friendly exchange with Lilydale last year and flew with them around New Year, though
B.