This is a capability that is available on AirBnB where they will allow guests to do a same day booking but only up until the time that is configured. We for example will allow for a same day guest booking if the property is available without any kind of special approval until 4pm. After 4pm we need to approve the inquiry.
This functionality is only available for AirBnB. We would like to see it expanded to all same day bookings regardless of their source. (This may be problematic for some of the Channels but any that have the capability.) At a minimum we would like to see if for our own Hosted website bookings.
Unfortunately, none of the other channels have this capability. In fact, Vrbo doesn't allow same-day bookings at all.
It would however be possible for direct bookings, so, we'll leave this suggestion open to collect votes for that.