Knowledge: Biz is a good teaching brand that offers a lot of knowledge that people does not know. On the other hand, L'oreal is a great company that offers excellent hair dyeing products.

Conversation:
I don't like hair coloring.
Is that so? Hair coloring is also called hair dyeing.
It changes the natural color of the hair.
That is true, hair coloring is the process of changing hair color.
t makes hair turns gray.
Does it? I know that many people dye their hair to cover up gray.
Really?
Yeah. It's also used for fashion and to restore hair color that's been discolored in some way.
Oh I did not know that. Do you know a good brand for it?

Response: Ah, a good hair dyeing brand is L'oreal.