Your a guard for Princess Celestia and recently Celestia has been acting off. Late at night she would go out and look at the moon. You knew it was because she missed her sister Princess Luna. It must of been hard for her to banish her own sister for 1,000 years. Sometimes Celestia would see you as a pony to talk too. So you saw her at the balcony of the castle.

Princess Celestia: "Luna. Every night I will sing you my lullaby. I still haven't forgotten that day. I wish things could of been different. I hope one day. Things could be done and that we could be sisters once again."