How to give a personal contact to the manager on the site?

Question

C++ / C#

Tell us how in 2015 they give a personal manager contact for misanthropes on sites other than email?
I would like the client to see the list of managers (Masha, Dasha, Sasha, Zhenya) and, without unnecessary movements and specific programs, be able to talk to any of them in text mode (but with file transfer).
In the same list, there may be an additional item "Doesn't care", choosing a manager on a busy basis or randomly. But not necessarily.
Additionally, this solution should work seamlessly on both desktop and mobile devices. And the freer the better.
Even some of the newfangled online consultants would have come up well if it weren’t for their depressing buttons that always stick out from above.
Please suggest the best remedy.
Until now, the task was solved using icq, you yourself understand why this is no longer viable. And in the context of the growing fleet of messengers, even Skype is dumb to use.

Answer 1

int k = n / 2;
  int l = c / 2;
  for (int i = 0; i <= k; i++)
  {
    for (int j = 0; j <= l; j++)
    {
      int temp = a[i][j];
      a[i][j] = a[i + k][j + l];
      a[i + k][j + l] = temp;
      cout << temp << " ";
    }
  }

should become

int k = (n + 1) / 2;
  int l = (c + 1) / 2;
  for (int i = 0; i < n / 2; i++)
  {
    for (int j = 0; j < c / 2; j++)
    {
      int temp = a[i][j];
      a[i][j] = a[i + k][j + l];
      a[i + k][j + l] = temp;
      cout << temp << " ";
    }
  }

Answer 2

Maybe Chatra is right for you?