Hi II and Shir,
You can make a tentative booking on your preferred date. If any other couples who wish to take up the date, the hotel mgr will give u 1 day to consider whether to confirm the booking. As long as there is no enquiry on your preferred date, I think the date will be reserved to you.
What happened to me the other time was that I enquire a few dates which had already gotten some tentative booking. So Sen will call the couple and give them 1 day grace period to confirm their booking. If they are able to confirm, that date will go to the couple who booked first.
I booked mine in Dec, and my AD is in May 08, so was pretty rush and imposed much trouble on Sen but thank god, she so helpful and easy to approach. Still rem the numerous calls that I made to her..........haha
Hope this info helps