Watching a movie, I've just heard of this lines:
A: "I'm just looking for Barbie. Is he around?"
B: "I haven't seen him."
I've always been confused about present perfect and simple past. So why did B say so, not "I didn't see him." What's the difference?
The dialogue appears to be from the first episode of Under the Dome and "Barbie" is the nickname for a male character named Dale 'Barbie' Barbara.