请问下面这段对话的意思,

请问下面这段对话的意思,"Let me finish with these gentlemen," my barber called out to me."Take your time," I said,and settled down to watch the fun."Good progress since last time,sir," the barber said to the bald man."I can see growth of many small but new hairs." Without lifting his head,the bald man responded,"I have been regularly using the hair cream you recommended.You really think there are new hairs?""Without a doubt," the barber asserted."With 30 years experience,I can always tell when I see new hair.Besides,I have been handling your hair for the last 20 years.I know the difference.That hair cream has worked for many people,not everybody.Clearly in your case it seems to be working."