Здравствуйте. Нужна помощь. Нужно дополнить диалог. Спасибо

A: May I come in?
B: Yes, you may.
A: Can I sit here?
B: Yes, sure.
A: Oh, I can't find my pen.
B: Can I help you?
A; No, thanks. I've got it.
B: Could I have your pencil, please?
A: Here you are.
B: Thank you.