A library has a certain number of soundproofed rooms in which students can practice class presentations and do zoom sessions without disturbing the other library patrons, but during the busy season...

Extracted text: A library has a certain number of soundproofed rooms in which students can practice class presentations and do zoom sessions without disturbing the other library patrons, but during the busy season they're often all full. At such times, the library wishes to use a program to let students sign in while they wait so they can fairly manage access to the rooms. Which agenda-type data structure would be appropriate for such a scenario, and why?