They actually have a conversation in the book Revenge of the Sith, hold on ill just go type it out for you...............
The astromech squeaked and beeped; C-3PO's auto translator interpreted: NOBODY TELLS ME ANYTHING.
"Of course not. You don't keep your end of the conversation."
A whirring squeel: SOMETHING'S WRONG. THE FACTORS DON'T BALANCE.
"You can't possibly be more confused that I am."
YOU'RE RIGHT. NOBODY CAN BE MORE CONFUSED THAN YOU ARE.
"Oh, very funny. Hush now-what was that? I think-he's saying something about a rebellion-that the Jedi have tried to overthrow the Republic! And-oh, my goodness. Mace Windu has tried to assasinate Chancellor Palpatine! Can he be serious?"
I DON'T KNOW. ANAKIN DOESN'T TALK TO ME ANYMORE.
"How can Master Windu be an assasin? He has such impeccable manners."
LIKE I TOLD YOU: THE FACTORS DON'T ADD UP.
"I've been hearing the most awful rumours-they're saying the government is going to banish us-banish droids, can you imagine?"
DON'T BELIEVE EVERYTHING YOU HEAR.
"Shh. Not so loud!"
I'M ONLY SAYING THAT WE DON'T KNOW THE TRUTH.
"Of course we don't." C-3PO sighed. "And we likely never will".
That is the actual conversation as in the novel. I took out the parts explaining what Anakin and Padme were doing otherwise it would have taken ages to type out lol.
- Lord Naphal