Pi 2

First things first, we saved the phone number, and saw if it synced with any social medias. It gave an instagram (https://www.instagram.com/donnylockheart9/?hl=en). The first thing to do: check the highlights. The highlights reveal to us a few things, his full name and his city.

He also left a boarding pass on there, with him flying into Amsterdam on Friday 17th, at 1:45 pm. Using my aviation nerd skills, I searched up flights arriving into schipol at 1.45 pm, and i got the flight number.

Slapping together everything in a flag form, we get

Flag: rgbCTF{donovanlockheart:birmingham:gb:kl1426}