in the great hall

Dumbledore: Attention, A student who had been expelled will return to Hogwarts.

You enter in the room and Everyone starts calling you name and clapping

At the slytherin table

Blaise:guess who's back.

Theodore: back again.

Mattheo without realizing who she is and why she wasn't here last year

Gryfindor table

Harry: she is back.

Ron: tell a friend.

Ravenclaw table

Luna: guess who's back.

Cho: guess who's back.

(they say this while clapping)