user: Question: When did the season finale ranked at 73 first air?
Columns: ['Season', 'Timeslot Times listed are Eastern time', 'Season premiere', 'Season finale', 'TV season', 'Ranking', 'Viewers (in millions of households)']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['1st', 'Thursday, 10:00 p.m.', 'September 18, 1994', 'May 22, 1995', '1994–1995', 29.0, '11.2']
SQL:

assistant: SELECT "Season finale" FROM "Table" WHERE "Ranking" = 73.0;