liminals.
Meet·Beginner·Playground·10 min·Updated Sep 30, 2026

Resolve a double-booked attendee

Teams×CopilotChatGPT

Scenario

Someone's calendar has them in two places at once today.

Mission

Find who's double-booked and when.

Start Files

attendee-schedule.csv
9 meetings across 3 attendees, one afternoon.
EventIDAttendeeStartEndTitle
EV-1Priya Shah09:0009:30Standup
EV-2Marcus Webb09:0010:00Client Call
EV-3Priya Shah10:0011:00Design Review
EV-4Noor Al-Sayed10:3011:301:1
EV-5Marcus Webb11:0012:00Planning
Preview — first 5 rows of attendee-schedule.csv

Your task

  1. Group the meetings by attendee.
  2. Sort each attendee's meetings by start time and check for overlaps.
  3. Identify who's double-booked and exactly which two meetings conflict.

Prompt idea:

Here is a meeting schedule for 3 people. Find who has two overlapping meetings, which two meetings they are, and the exact overlapping time window.

Check Your Result

Which attendee has two overlapping meetings on their schedule?

Need a hint?

Group by attendee, sort by start time, and check whether any meeting starts before the previous one for that person ends.

Reveal Solution

The solution files contain the completed challenge. Review the approach to see if you missed any edge cases.

conflict-solution.csv

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