How do you add a name with spaces when working with C++?

Question

I am new to C++ and I am required to make a vehicle billing system program (command line)

My problem is when I try to add a name with spaces (John Doe) the program goes into a loop crash.

here is a snippet of my code. Can you show me where am I doing wrong?

a little bit about the program I am trying to code. It starts with a login and upon successful login, it takes the user to a menu.

this is the code snippet after you choose menu one. it is supposed to open a text file and register the details that the user have inputted.

#include <iostream>
#include  <stdlib.h>
#include<string>
#include<fstream>
using namespace std;

struct car {

//attributes
ofstream writer;
ifstream Reader;



//variables for sample 1 menu
    string date;
    string vehicleNumber;
    string manufacturer;
    string manufacturerCountry;
    int manufactureYear;
    int mileage;
    string registeredOwner;


//variables for sample 2 menu
   double price [10],qty[10];
   double total;
};


//function menu for car details
void carDetails()

{
    car details;


    //adds the data to the following car data fields
    cout <<"Date = "; cin >> details.date;
    cout <<"Vehicle Number = "; cin >> details.vehicleNumber;
    cout <<"Manufacturer = "; cin >> details.manufacturer;
    cout <<"Manufacturer Country = "; cin >> details.manufacturerCountry;
    cout <<"Manufacture Year = "; cin >> details.manufactureYear;
    cout <<"Mileage in kilometers = "; cin >> details.mileage;
    cout <<"Registered Owner = "; cin >> details.registeredOwner;

    //opens and write a .txt file for car info
    details.writer.open("car details.txt",
    std::ios_base::app);
    //adds following car info data fields to the txt file
    details.writer <<"Date = " <<details.date << endl;
    details.writer <<"Vehicle Number = " << details.vehicleNumber << endl;
    details.writer <<"Manufacturer = " <<details.manufacturer <<endl;
    details.writer <<"Manufacturer Country = " <<details.manufacturerCountry <<endl;
    details.writer <<"Manufacture Year = " <<details.manufactureYear <<endl;
    details.writer <<"Mileage in kilometers = " <<details.mileage <<endl;
    details.writer <<"Registered Owner = " <<details.registeredOwner <<endl;
    //dash break
    details.writer <<"\n---------------------------------------";
    details.writer.close();

            cout <<"\n Press any key and press ENTER to return back to Main Menu: ";
cin >> details.date;
//clears console
system("cls");
}