Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_50 (date_from VARCHAR, position VARCHAR, name VARCHAR)
### Question:
What is the date for the MF position and player Jennison Myrie-Williams?
### Answer:
SELECT date_from FROM table_name_50 WHERE position = "mf" AND name = "jennison myrie-williams"