Match concept

Attempt Match with id attemptId, sourceId alice and targetId ben

Withdraw Attempt attemptId

Show Attempt attemptId

Attempt Match with sourceId ben and targetId alice

Show Match between alice and ben

Show Match between ben and alice

Show Matches

Show Matches with alice

Show All Attempts

Show Attempts by alice

Show Attempts with alice

Show Attempts between alice and ben

Create Match with id matchId, userIds ben and carol

Show Match matchId

Delete Match with id matchId