Use of undeclared identifiers even though class is created in c++

Question

I have created a class ShowTicket coded as follows in a header file:

#include <iostream>
#include <string>
#include <sstream>
using namespace std;
    class ShowTicket {
    public:
        //function that returns true if sold status is true and false if it doesnt.
        bool is_sold(void){
            if (sold_status == true){
                return true;
            }
            else{
                return false;
            }
        }
        //function that sets sold_status to true
        void sell_seat(void){
            sold_status = true;
        }
        //prints row, seat number and sold status in casual terms
        string print_ticket(void){
            ostringstream sout;
            if(sold_status == true){
                sout<<row<<" "<<seat_number<<"sold";
            }
            else{
                sout<<row<<" "<<seat_number<<"available";
            }
            return sout.str();
        }
        //initilizes variables in constructor
        bool sold_status;
        const char* row;
        const char* seat_number;

    //constructor
        ShowTicket(const char* row, const char* seat_number, bool sold_status){
            sold_status = false;
        }
    };

I am using a main file with the following code to test this class

#include <iostream>
#include <string>
#include <sstream>
#include "showticket.h"
using namespace std;

int main () {
    ShowTicket myticket1(“AA”,”101");
    ShowTicket myticket2(“AA”,”102”);
  if(!myticket1.is_sold())
    myticket1.sell_seat ();
  cout << myticket1.print_ticket() << endl;
  cout << myticket2.print_ticket() << endl;
  return 0;
}

I am receiving multiple "Use of undeclared identifier" errors and "Non-ASCII characters are not allowed outside of literals" errors and I do not know how to fix them.

Any help is greatly appreciated.