In pairs, observe the dialogue below. Then, answer the questions that follow.

Mr Andi: Good morning Ms Hana, and welcome to our school.

Ms Hana: Thank you, Mr Andi.

Mr Andi: I must tell you about your duties in our school library.

Ms Hana: Oh yes, of course. I want to start working as soon as possible.

Mr Andi: Well, first you must serve teachers and students who come to the library, but you mustn't let them speak loudly in the library.

Ms Hana: OK. I understand.

Mr Andi: You must be friendly to everybody but you mustn't chat with the other employees in the library. You must work very hard, Ms Hana.

Ms Hana: Of course, Mr Andi.

Mr Andi: And you must keep books and electronic media in this library in good condition.

Ms Hana: All right, Mr Andi. Everything is perfectly clear.

Who are involved in the dialogue?