On what date was Patty Fendick an opponent?
CREATE TABLE table_31551 (
    "Outcome" text,
    "Date" text,
    "Tournament" text,
    "Surface" text,
    "Opponent" text,
    "Score" text
)
SELECT "Date" FROM table_31551 WHERE "Opponent" = 'patty fendick'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: On what date was Patty Fendick an opponent? ### Input: CREATE TABLE table_31551 (
    "Outcome" text,
    "Date" text,
    "Tournament" text,
    "Surface" text,
    "Opponent" text,
    "Score" text
) ### Response: SELECT "Date" FROM table_31551 WHERE "Opponent" = 'patty fendick'