「宅急便です。」

= Takkyuubin desu.

= Delivery service.

「ご苦労様」

= Gokurou sama.

= Thank you (for your work ) .

Zelda:「また、勉強さぼってるの？」

= Mata, benkyou sabotteru no?

= Are you slacking off in your studies again?

Nayru:「お互い様」

= Otagai sama 

= Looks who’s talking.