@Abigail103 You say you just contacted the host this morning and they haven't replied- are you aware that there is a time difference and that it would be the middle of the night there and the host is most likely asleep? There's no reason to panic just because you don't get a response immediately. Even without a time difference, hosts can be at work, busy, out of internet range, or whatever when a guest tries to contact them- have a little patience, it isn't reasonable to expect that you'll get an instant response.
Of course, if a day or two goes by with no response, that is cause for concern, and as you did, contacting Airbnb usually works for them to make contact with the host. I've had to do that myself for guests who didn't answer my messages for days.