Tree game implemented in C++

tree.cpp

#include <iostream>
#include <string>

using namespace std;

struct Node
{
public:
    // Answer constructor
    Node(string answer) :
        is_question(false),
        text(answer)
    {}

    // Question constructor
    Node(string question, shared_ptr<Node> yes, shared_ptr<Node> no) :
        is_question(true),
        text(question),
        yes(yes),
        no(no)
    {}

    bool is_question;
    string text;
    shared_ptr<Node> yes{nullptr};
    shared_ptr<Node> no{nullptr};
};

shared_ptr<Node> get_initial_tree()
{
    return make_shared<Node>("Это млекопитающее?",
        make_shared<Node>("кошка"),
        make_shared<Node>("таракан"));
}

bool ask_user()
{
ask:
    string input;
    getline(cin, input);
    if (input == "y" || input == "д") {
        return true;
    } else if (input == "n" || input == "н") {
        return false;
    } else {
        cout << "Пожалуйста, введите д или н. ";
        goto ask;
    }
}

int main()
{
    auto game_tree = get_initial_tree();

start:
    string user_input;
    cout << "Загадайте животное и нажмите Enter. ";
    cin.get();

    auto current_node = game_tree;
    bool decision;

process_node:
    if (current_node->is_question) {
        cout << current_node->text << " ";
        decision = ask_user();
        current_node = decision ? current_node->yes : current_node->no;
        goto process_node;
    } else {
        cout << "Это " << current_node->text << "? ";
        decision = ask_user();
        if (decision) {
            cout << "Обожаю играть с вами!" << endl << endl;
            cout << "Сыграем еще раз? ";
            decision = ask_user();
            if (decision) {
                goto start;
            } else {
                return 0;
            }
        } else {
            string user_answer, user_question, wrong_answer;
            cout << "Сдаюсь. Какое животное вы загадали? ";
            getline(cin, user_answer);
            cout << "Введите вопрос, который позволит отличить " << current_node->text << " и " << user_answer << ": ";
            getline(cin, user_question);
            cout << "Каков ответ на этот вопрос для " << user_answer << "? ";
            decision = ask_user();
            wrong_answer = current_node->text;
            current_node->is_question = true;
            current_node->text = user_question;
            (decision ? current_node->yes : current_node->no) = make_shared<Node>(user_answer);
            (!decision ? current_node->yes : current_node->no) = make_shared<Node>(wrong_answer);
            cout << endl;
            goto start;
        }
    }
}