text: 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_38 (date_of_appointment VARCHAR, team VARCHAR, replaced_by VARCHAR)
  ### Question:
  What was the date of appointment for Christos Kassianos who belonged to AEK?
  ### Answer:
  SELECT date_of_appointment FROM table_name_38 WHERE team = "aek" AND replaced_by = "christos kassianos"