I saw a girl __________ me __________, so I decided to go say hi.
Type the full sentence, or
check in
phrasal verb
arrive and register at a hotel/airport
"Our flight leaves at 2:00 p.m., but we must check in before 11:00 a.m."
communicate with someone, to report on progress or just see how they are doing
"Hey Matt, I just wanted to check in and see how you're doing."