Thank you!
I'll call them and try - might still have a chance for Saturday.
Just looked up the availability and as you mentioned Sunday is completely full

I should have asked earlier - I was put on the waitlist last Thursday when both 2:20 PM flights BNE-SYD still had D4/D6 available (LH just wasn't able to rebook my ticket on those flights which is a separate issue).
Thanks again,
zap!