person A: One of my much younger sister's is starting college in a couple weeks. I am so excited for her.
person B: That is awesome. Do you know what she wants to study?
person A: She told me she wants to become a dentist_comma_ but she's a little fickle. I will see what she says she wants to do in a year. 
person B: As long as it is something she enjoys. I am sure you are very proud of her!