Создание класса (создать класс информационной системы тур агенства)

#include <iostream>
#include <vector>
#include <functional>
#include <algorithm>
 
class Travel
{
public:
   Travel(const std::string& name, const int day_n, const double pr):
      title(name), day_no(day_n), price(pr)
   {
   }
   const std::string get_title() const { return title; }
   const int get_day_number() const { return day_no; }
   const double get_price() const { return price; }
private:
   std::string title;
   int day_no;
   double price;
};
 
class TravelAgency
{
public:
   TravelAgency(const std::string& name, const std::string& phone_no, const int c_year):
      title(name), phone(phone_no), cr_year(c_year)
   {
   }
   const std::string get_title() const { return title; }
   const std::string get_phone() const { return phone; }
   const int get_cr_year() const { return cr_year; }
   void add_travel(const Travel& trav) { travels.push_back(trav); }
   const std::vector<Travel>& get_travels() const { return travels; }
private:
   std::string title;
   std::string phone;
   int cr_year;
   std::vector<Travel> travels;
};
 
template<class T>
std::vector<TravelAgency> get_agencies(const std::vector<TravelAgency>& agencies, const T& comparator)
{
   std::vector<TravelAgency> result;
   std::copy_if(agencies.begin(), agencies.end(), std::back_inserter(result), comparator);
   return result;
}
 
int main()
{
   TravelAgency first("1", "4951121122", 2001);
   first.add_travel(Travel("Moscow", 12, 550));
   first.add_travel(Travel("Ekaterinburg", 12, 400));
   first.add_travel(Travel("Paris", 12, 1000));
   TravelAgency second("2", "4953321122", 2005);
   second.add_travel(Travel("Madrid", 12, 1000));
   second.add_travel(Travel("New-York", 1, 100));
   std::vector<TravelAgency> agencies = {first, second};
   const double price = 500;
   agencies = get_agencies(agencies, [price](const TravelAgency& agency)) -> bool;
   {
       std::vector<Travel> travels = agency.get_travels();
       size_t count = std::count_if(travels.begin(), travels.end(), [price](const Travel& tr)) { return tr.get_price() > price; };
       return count > travels.size() % 2;
   };
   std::for_each(agencies.begin(), agencies.end(), [ ](const TravelAgency& agency)); { std::cout << agency.get_title() << std::endl; };
}