CREATE TABLE table_31124 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT)

What is the production code for the episode whose original air date was May15,2000?
SELECT "Production code" FROM table_31124 WHERE "Original air date" = 'May15,2000'
SELECT "Production code" FROM "table_31124" WHERE "Original air date" = 'May15,2000'