Okay, as per title, I found iPhone 6 on the street, the battery is almost flat and I don't have iPhone charger.
What to do now?
If by the time the battery flat, the owner is not ringing me, what can I do with this iPhone?
UPDATE: Okay, I managed to purchase iPhone charger from local shop (as suggested below), and the owner called this morning and I returned the iPhone. Thanks for the suggestions guys!
I've done this for other mobiles I found on the street.
Look through the message history and message the last few people and type "This person has lost their mobile phone, please ask the owner to call <my phone number> so I can return it to them."
Some people are like "meh, give me my phone", others are really grateful.
Also, for incoming calls (that appear as a name), don't answer, but send out an SMS as above. Then the owner (or a friend of the owner) will contact you to return the phone.
Hope they get their phone back and you get a reward of some sort.