Read the following text and answer the question.

Anggit: Good afternoon, Mr Suryo.

Mr Suryo: Good afternoon, Anggit. Why don't you go home?

Anggit: I'm waiting for my father. He is going to pick me up. That's my father.

Mr Suryo: Good thing that he arrived on time.

Anggit: Dad, please meet my English teacher, Mr Suryo. Mr Suryo, this is my father.

Mr Wawan: Pleased to meet you, Mr Suryo.

Mr Suryo: Pleased to meet you, too, Mr ...?

Mr Wawan: Wawan. My name's Wawan.

Mr Suryo: Pleased to meet you, Mr Wawan. I'm sorry I have a meeting.

Mr Wawan: That's fine Mr Suryo. You may go.

Mr Suryo: If you'll excuse me Mr Wawan. Good afternoon, Anggit.

Anggit: Good afternoon, Mr Suryo.

Why does the teacher have to go?