I am a professor. What I want is for students to quickly and efficiently book 15 meeting slots with me during pre-defined times and they should appear in my cal

I am a professor. What I want is for students to quickly and efficiently book 15 meeting slots with me during pre-defined times and they should appear in my calender. My university uses the Office365 suite, and I don't think the above is possible. Either I share my entire Busy/Free calender with them, and specify acceptable times in some other way. Or do a back and forth with them via email.