def multiply_my_ticket_values(columns, my_ticket):
    """ Adds columns to my_ticket and returns product of values with departure columns.

    :param columns: list of labels
    :param my_ticket: df
    :return: int
    """
    product = 1
    # set columns
    my_ticket.columns = columns
    # iterate over columns and multiply if departure in column name
    for column in columns:
        if 'departure' in column:
            product *= my_ticket[column]

    return product