A slightly different way of putting it besides what @Patricia2526 suggested, I end up saying:
"Every guest is different and it is by reading the message notes between us it's what makes it so helpful for us not to forget anything."
And it is true, through the messages we are reminded of: when they are arriving, how, where are they staying, pick up time, where to pick up, cook or no cook, going fishing or not, going on a tour or not, special needs as to equipment, special food, make sure to bring this or that, check out time, flying or shuttle or rent-a-car, etc etc
And oh, easier to say no to a discount request or to book off-grid via text than when on the phone. 😎