Multi classes in c++

#include<iostream>
#include<conio.h>
#include<string>
#include<vector>
using namespace std;
class user
{
      private:
      string name;
      public:
      void setName(string n)
      {
           name=n;
           }
     string getName()
     {
            return name;
            }
};
class Server
{
      private:
              int i;
              vector<user>Contant;
              public:
              void AddUser(user us)
              {
                   Contant.push_back(us);
                   }
      user get_by_name(string nam)
      {
           for( i=0;i<Contant.size();i++)
           {
                   if(Contant[i].getName()==nam)
                   {
           return Contant[i];
          
           }
         
           }
           }
           };           
int main()
{
    user user1;
    user1.setName("Tom");
    user user2;
    user2.setName("Jarry");
    Server s;
    s.AddUser(user1);
    s.AddUser(user2);
    user getuser=s.get_by_name("abd");
    cout <<"name found: "<<getuser.getName();
    getch();
    return 0;
}