how to reference columns as dynamic selectables in select query

cursor C1 is

select col1, col2 from table1;

/*  assume col1 is returning EMP_NAME & col2 is returning EMP_ID*/

in the code we are referring to C1 as below

OPEN C1

FETCH into l_col1, l_col2; /*l_col1 & l_col2 are user defined variables in the procedure */

select  l_col1,l_col2 fetch into l_emp_name, l_emp_id from EMP_DETAILS; /* l_emp_name and l_emp_id are user defined variables in the procedure */

/* we are expecting the query to be evaluated as below.

select EMP_NAME ,EMP_ID fetch into l_emp_name, l_emp_id from EMP_DETAILS;