What is the pennant with Denny, Dumbarton as the builder?
CREATE TABLE "ch_or_12th_emergency_flotilla" (
  "name" text,
  "pennant" text,
  "builder" text,
  "laid_down" text,
  "launched" text,
  "commissioned" text
);
SELECT "pennant" FROM "ch_or_12th_emergency_flotilla" WHERE "builder"='denny, dumbarton';