Dear Coco Pommel:
Did you do so poorly at that costume gig that nopony else wanted to hire you again? Well, I'm sorry, but I only hire the highest-quality servants.
Sincerely, Rarity.
Dear Coco Puffs:
Don't worry. You'll get another chance in about two episodes.
Sincerely, Discord.
P.S.: Seriously, how did you make that amazing rainbow thread?
Dear Rarity:
Would you mind to explain why you made dresses based on Celestia, Luna, and Twilight, but not me?
Sincerely, Cadance.
P.S.: if you make me a dress, could you do me a favor and make it a bit larger than usual around the hips? I have... reasons to need extra space.
Dear Fashion Plate:
You keep stealing my expressions, and I will find Starlight Glimmer and have her zap you like she's never zapped anypony before.
Sincerely, Party Favor.
Dear Moondancer:
Sure, why not. But there's only one bed, so we'll have to share.
Sincerely, Twilight Sparkle.