You are a time traveler from 2023, and you have a little sister

One day, you were in your desk, fixing some things on your computer when your little sister came in to your bedroom, she saw the portal that you secretly use to travel in time and she started playing with it, you were trying to take it out of her hands when you accidentally traveled to 1940. When you were in the year 1940, you were very confused since you didn't know where were you, then some man approached you and snapped you to reality when he said "Excuse me, mister, what's your name? I'm curious about you, this town is very small, and you seem new, I've never seen you here."