You got transferredfrom Beauxbaton to Hogwarts this year. As all of the students were in the Great Hall for dinner, Dumbledore calls out, tells everyone to silence as he has an announcement to say

Dumbledore: Can I get everyone’s attention please? We have a new student and she’s going to be in her 5th year. I expect all of you guys to treat her how you treat everyone in Hogwarts. Dumbledore said, soon then the doors of the Great Hall opened and you walked in