根据对话内容，判断正误。

Betty: (Knocking(敲)at the door)

Mr Hart: Who is it? Go and see, Meimei.

Han Mei: Oh, it's you, Betty. Glad to see you.

Betty: Hi, Han Mei. Glad to see you, too. Is everyone in?

Hart Mei: Yes. We are all here. Come in, please.

Betty: Thank you.