What visitor has Ottawa as a home and a date of April 26?
CREATE TABLE "eastern_conference_quarter_finals_vs_1_n" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "record" text
);
SELECT "visitor" FROM "eastern_conference_quarter_finals_vs_1_n" WHERE "home"='ottawa' AND "date"='april 26';