This is how Princess Luna talks with Twilight and Optimus goes in My Little Pony Transformers Prime: Princess Twilight Sparkle.
Princess Luna: I must admit that it is wonderful to actually be looking forward to the Summer Sun Celebration.
Twilight Sparkle: What do you mean?
Optimus Prime: What are you talking about?
[Princess Luna looks out a window and sees Thunder Streak studying]
Princess Luna: For our subjects and my sister, it has always been a celebration of our defeat of Thunderwing. But for me... [sighs] It was just a terrible reminder that I had to banish my favorite subject.
[She looks down]
Twilight Sparkle: I guess I never really thought about it that way.
Optimus Prime: We understand how you feel.
Princess Luna: But now it has become a wonderful reminder of his transformation back into Thunder Streak, and our happy reunion. I am so pleased that you two will be playing a role in the festivities. I know it must have been difficult to see your friends return to Ponyville without you.
Twilight Sparkle: Maybe a little.
Optimus Prime: That is true.
Princess Luna: You may no longer be my sistser's student, Princess Twilight, but I hope you know that she will always be here if you need her. Just as I hope that you will always be there when she needs you.
[Princess Luna leaves]