Read the dialogue, then answer the questions!
 

Situation: In the afternoon at a park.

Nino: Hi, Hilda. Are you also here to walk around?

Hilda: Hi, Nino. Yes, the weather is nice to walk around the park.

Nino: With whom do you come here?

Hilda: I'm alone. Who is she, Nino?

Nino: She is Nita. She is my little sister.

Hilda: Where does she study?

Nino: She studies at Prima Primary School. She is at grade six now.

Hilda: How old is she?

Nino: She is eleven years old. I'll call her. Nita, come here please.

Nita: Yes, brother. Why do you call me?

Nino: I want you to meet my classmate, Hilda.

Nita: I'm Nita. Nice to meet you, Hilda.

Hilda: Nice to meet you too, Nita.

Nita: Where do you live?

Hilda: I live near to this park, at Pen Street No.7.

Nita: Are you alone here?

Hilda: Yes, I am.

Nita: Would you like to join us?

Hilda: That would be nice.

Nita: Let's go now.

Who are they in the dialogue?