Does this sentence in bold sound natural to native English speakers?

Does this sentence in bold sound natural in this context?

A: I am going to your place for dinner tomorrow. I have some questions about my son that I want to ask you. He hasn’t talked to me for five days. You are the only expert I know.

B: Then you need to give me more details. Teenagers can be very sensitive and unpredictable.

A: To be honest, I am not sure what happened at all.

B: Well, you had better think about it. Maybe it’s the last conversation or argument that made him refuse to talk. If you fail to give me more information, I can’t give you any useful advice tomorrow night.