Regarding swagger API repeated data how to shown shown

[HttpGet("getDeparts")]
        public async Task<ActionResult<User>> getDeparts(string DeptName)
        {

         User ues = await DBCon.department.Select(
             s => new User()
             {
                 id=s.id,
                 FirstName = s.FirstName,
                 LastName = s.LastName,
                 Gender = s.Gender,
                 DeptName = s.DeptName
             }).FirstAsync(s =>s.DeptName == DeptName.ToString());
           if(ues == null)
           {
               return NotFound();
           }
           else
           {
               return ues;
           }
        }