<human>: Can you provide a brief rundown of the text in within 3 sentences?

I tried to find the owner by calling the last number dialed, since it was not locked. A girl, who was next to the owner, picked up the phone. However, upon explaining, neither she or he seemed to be happy and when I told them that I would not be able to hand it back at this very same moment, they even got angry: "Why do you take a phone if you cant give it back". Obvious WTF moment. No gratitude - nothing. I didnt even ask for money or anything.
I explained that I couldn't because I had to work. 
The next moment they hang up on me. Some minutes later they tried locating the phone - luckily I already deactivated GPS.
So what should I do? I know the name and everything of this guy, but he didn't seem to care that I want(ed) to give him his phone back.
<bot>: Contacted owner - couldnt meet up at the very same moment - owner got angry and hang up on me trying the 'police' way. What to do?