Statistics program

I am making my first program and am having a little bit of trouble. I want to have the program create files that have a file name that is the same as an input, but an error always occurs when i try. Here is my code so far:

Code:

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>

using namespace std;
int main () {
    
    string fname, lname, number, hits, n,;
    cout << "Enter first and last name ";
    cin >> fname;
    cin >> lname;
    cout << "Enter number ";
    cin >> number;
    cout << "Enter Hits ";
    cin >> hits;
    cout << lname;
  ofstream myfile (lname.txt_str());
  if (myfile.is_open())
  {
    myfile << "Name                     Number                          Hits.\n";
    myfile << " ";
    myfile << ""<<lname<< ", " <<fname<<  "                  " <<number<< "                   " <<hits<< "\n";
    myfile << ""<<n<<".\n";
    myfile.close();
  }
  
  else cout << "Unable to open file";
  cin >> n;
  
  return 0;
}