When you call to make your ADR's tell them about the allergy and they will have you contact the restaurant 24-48 prior to your arrival to talk to them about his milk allergy, and also mention that you would like soy milk, I do it as both my DD have food allergies and they are very good about making sure neither of them get milk or eggs in their food along with no cross contimination from nuts if they can't guarantee it then they won't let them eat that particular food. Alot of times the chef comes out and personally makes my kids food brings it to the table at each restaurant and guarantees it is safe for them to eat. They really are good with allergies.
Shelby