Introduce yourself in Japanese Language

Dialoque:
Andy: Ohayo Gozaimasu (John-kun)
John: Ohayo Gozaimasu (Andy-kun)
　　　　Kore wa Lia desu.
　　　　(kore wa wa) imoto desu

Lia: 　Hajimemashite Dozo yoroshiku
Andy: Hajimemashite (Boku wa) Andy desu.
　　　　Dozo yoroshiku.


Dialogue:
John: Good afternoon, Andy
Andy: Good afternoon, John
　　　　This is Lia This is (my) younger sister

Lia: How do you do? Pleased to meet you
John: How do you do? I am John Pleased to meet you.