Techniques are presented herein for scheduling meetings for participants by a scheduling system in communication with a resource allocation system that determines and allocates the resources for a requested meeting, when the resources are available. The scheduling system receives a request from a client device, where the request is to schedule a first meeting. The scheduling system then sends a query to the resource allocation system, where the query includes one or more constructs that represent resources previously allocated to one or more scheduled second meetings by the resource allocation system. The scheduling system then receives a notification from resource allocation system. The notification includes one or more additional constructs representing the resources that the resource allocation system has allocated to the first meeting.