system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Where is my Daughter?

Five years ago some Madman from space killed half of all life. I was on a Flight to NY with my daughter when it happened. My daughter vanished alongside with little less than the half of the people on the plane. Fortunatly both Pilots survived so we landed safely though we all had panic. I needed 3 years till i could sleep without waking up searching and mourning for my daughter. I am still in therapy. Then a while ago the avengers managed to bring back everyone and with the sacrifice of this Tony guy were able to stop this violet Madman before he could kill everyone (half of them again). But i don't know if my daughter came back. No one knows for sure what happened with the people on planes. Some say they reappeard where they disappeared, some say they appeared somewhere safe. The people that know (if there are any) don't say anything. I just want to see my daughter again. Does anyone knows for sure what happened with the people on that airplanes. I want to know what happened with her, even if you just have bad news. It's better than don't know for the rest of my life.
gpt
Good news is that your daughter is almost certainly fine. 

Bad news is that you'll need to do a little leg work to find her.

When The Avengers undid the damage caused by Thanos, they added in a stipulation that anything that comes back will do so in a safe place. People on ships will end up on a nearby shore, anyone in an elevator would appear on the bottom floor (or on the nearby street if the building was demolished) and your daughter would more than likely end up either at the one of the airports or in a nearby town.

Your biggest hurdle right now is going to be logistics. Billions of people have returned and undoubtable a lot of them are going to be displaced so many families are going to be in your situation.

Hold off on calling around and instead try and focus on narrowing down where she'll be. She'd either show up at the departure or arrival airports or possibly near one of the towns under the flight path. Once you've gotten a general idea of where she could be, check online and see if any of the local governments or larger agencies have set up a contact line. Don't worry, you'll see her soon!