As Duncan has suggested it will require some expertise and daylight/flash balance to replicate this in detail, however...
Assuming the room they intend to use has a large well lit 'picture' window as the sample you've shown then it may be possible to replicate it without too much extra gear.
The first thing they'll need is a sufficiently bright enough day to ensure reasonable shutter speed and aperture to achieve depth of field.
At approx 45 degrees to the window, facing the models a large white sheet can be used to reflect the light back into them, giving a soft light effect to the front.
It won't be an exact match but it will go someway to replicating the image.
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