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Question :: Sharepoint Help needed

I'm making a calender list for my company staffs for ease in booking meeting rooms, but I'm unable to design a workflow so as not to have a recurring date and time at a specific room.

Eg:- User (A) has already booked Room (A) at Date and Time (A).
How to prevent User (B) to book the same room at the same date and time.

I'm using Sharepoint Designer and WSS 3.0.
Thanks for the comments.