@Violeta32 you have 24 hours to accept or decline. You already asked him few questions and now just wait until he answers. Maybe he is in a different time zone or on the way so he doesn't check his messages at the moment.
If he doesn't answer you in 24 h period you can decline his request due to the lack of communication.
we also had some bookings which seemed weird and we were a bit worry but at the end everything was perfect. And vice versa...
Who knows, maybe his parents were working in SA and now they or he is working in Russia... there are meny people who just work and move arround the world constantly (lucky them :))