You have a couple of options here. Packages for the following year usually come out around June (so 2020 packages will be available June 2019). (Option 1) You can book them a room to lock them in now and then switch them onto a promotion when they come available. You absolutely must make sure you’re staying on top of promotions and offering them to any guests they would benefit. (Option 2) They can wait until package prices are announced and then book with you. The benefit of the former is that you have them booked, so they’re not likely to wander to another agency, and for them they have a guaranteed room, but don’t pressure them just give them both options. If you’re not able to book it online just call it in.