根据对话，判断下列句子正误。

Anna: Helen, who is this girl?

Helen: Oh! Let me see. She has a red and white dress. She is my sister.

Anna : What's her name?

Helen : Her name is Lucy.

Anna : Oh! I want to see your new dress. What color is it?

Helen : It is green. Green is my favorite(最喜欢的) color. Look! Here it is!

Anna : That's a nice dress.

Helen : Look! My skirt is new too. It's red.

Anna : It's very beautiful.

Helen : Let's go to buy a present for Jimmy this afternoon. His birthday is coming.

Anna : Good idea.

Helen : Let's go.