We are tasked with scheduling a set of meetings within a specific time frame, ensuring that no meetings overlap and all required participants can attend each meeting. 
The objective is to find a feasible schedule that accommodates the availability of all participants and fits within the given time constraints.

Example input data:
1. meetings.csv
meeting_id,duration,participants
1,1,John;Alice
2,2,John;Bob
3,1,Alice;Charlie
4,1,Bob;Charlie

2. availability.csv
participant_id,availability_start,availability_end
John,09:00,12:00
Alice,10:00,13:00
Bob,09:00,11:00
Charlie,11:00,14:00