This is how Galvatron talks to Starscream goes in Unfinished.
[We see Starscream standing alone in space on an asteroid with Soundwave and Sideways]
Starscream: How could I have failed? After so many millennia of battles wage, everything lies in ruin.
Soundwave: Please don't take it seriously, 'Scream.
Sideways: You won the battle against Galvatron anyways.
Galvatron: (voice) So, you're giving up. Heh, you're certainly no Unicron!
[A bright light blinds them and Starscream looks around to see everything in flames]
Starscream: How can this be?
Galvatron: You defeated me and this is all you have to show for it? How dare you give up before the job is done!?
[Galvatron, in spirit form, appears before him]
Starscream: You... Galvatron!
Galvatron: So you haven't forgotten me like you forgot your ambitions or was it just too much for you?
Starscream: You dare talk to me of ambition, you backstabbing fiend! If not for them, those accursed Autobots, I would have destroyed the universe!
Galvatron: Hehehe... well, whatever you have to tell yourself.
[Galvatron starts to dissolve]
Starscream: Galvatron! Come back here!
[But he's gone. Starscream notices Galvatron's cannon floating and grabs it]
Starscream: Hmmm, his cannon... As pathetic as it sounds, he's right! [crushes Galvatron's cannon] I am Starscream. I will destroy this universe and remake it in my image and nothing will stand in my way!
Soundwave: And we'll help ya!