The 'Scheduler' tools allows tutors to schedule one-to-one appointments with students.
Tutors can specify periods of availability and the length of each appointment. The students then book themselves into one of the available time slots.
Group appointments can also be set up using the standard group settings within a course.
Top tip: The 'Scheduler' tool can be made available to students if they need to make appointments with each other.
For more information, see docs.moodle.org - Scheduler.