@James1813 Ask him questions to clarify. "Hi Dave, thanks for your request. I don't think you understand what a booking request is. The host has to either accept or decline the request, and they make the decision to do that based on a guest's past reviews, the information in your profile, and the way a guest communicates. "Arriving at 5" assumes that the booking has been accepted and gives me no information to work with. Please be more forthcoming about why you were attracted to my listing, why you are travelling here, and a bit about yourself. Have you thoroughly read my listing info, including the house rules and cancellation policy?Also why is your profile in the name of a company? And I see you have not uploaded any verified ID to the Airbnb site nor written up any profile for yourself."
If he doesn't reply in time, or replies inadequately or in a way that doesn't set your mind at ease, decline.
BTW, I got one like that. Not a company profile, but the message said only "Arriving at noon". When I prompted him for more info, he was forthcoming and turned out to be a good guest.
I don't know the age of your guest, but a lot of young people these days seem to think all communication is like a two word text message to their friends.