Read the following dialogue! Then answer the questions!

Mia and Sophia were called by their teacher to his office. They quarreled because Mia lost her bracelet and she accused Sophia.

Teacher: If you both refuse to apologize, there will be a black mark.

Mia and Sophia: No, Sir.

Teacher: I suggest you don't put me to the test.

Mia: But I didn't do anything wrong.

Sophia: Me, too.

Teacher: Mia, do you have a proof why you accused Sophia? And you, Sophia, do you know that our school doesn't teach violence? Now, I suggest you think about that for a while. Then you call your parents and have them pick you up.

Mia: My mother works. She can't pick me up.

Sophia: Both my parents work.

Teacher: Then, have your maids pick you up. You can't leave this school unless you're accompanied by a parent or parent surrogate.

Mia: I can't call her, Sir. There is no credit on my phone.

Teacher: You can.use this telephone.

Sophia: My maid didn't answer my call, Sir. Perhaps she is busy.

Teacher: You should send her a message. Mia, the school is going to look for your bracelet. And Sophia, you should apologize to her. You pulled her hair.

Sophia: I'm sorry for pulling your hair, Mia.

Mia: Alright. Please forgive me for accusing you.

Teacher: You both wait here until your maids come.

Why does the teacher ask Mia and Sophia to call their parents?