Humorous jokes about selling shampoo

Student A: Hello. What brand of shampoo do you use?

Student B: Hello. I use Dove. I like it.

Student A: Why do you like it?

Student B: Because this brand of shampoo smells good, help me wash my hair very clean.

Student A: Have you ever used other brands of shampoo?

Student B: Yes. I have used several brands of shampoo, such as Head & Shoulders, Rejoice.

Student A: Why don't you use them anymore?

Student B: Because they are useless for me to wash my hair.

Student A: I see. Oh, I must go now. I'm going to class soon. Bye.

Student B: Goodbye.