为什么循环只运行一次?

我试图做一个电话系统，我在main{}中使用了一个while循环。我不知道为什么它只运行一次，除非我给它停止的命令，否则它应该运行无限的时间。

#include <iostream>
#include <string>
#include <fstream>
using namespace std;

void record(string name, int phoneNum, int count);
// main
int main() {
cout << " Welcome to use the Phone Contact Systerm " << endl;
string name;
int phoneNum;
int count = 0;
string signToStop;
cout << " Please enter name and phone number " << endl;
while ( cin >> name >> phoneNum){
cout << " If you want to start the program, enter start "     << endl;
cout << " If you want to quit the program, enter quit " <<     endl;
cin >> signToStop;
if (signToStop == "start"){
record(name, phoneNum, count);
}
else if ( signToStop == "quit" ){
break;
}
count++;
}
}
// record all name info into Name set and record all phone numbers     into PhoneNum set
void record(string name, int phoneNum, int count){
string Name[] = {};
int PhoneNum[] = {};
Name[count] = {name};
PhoneNum[count] = {phoneNum};
// now start to record all the info into .txt document
ofstream phoneFile;
phoneFile.open("contact.txt");
phoneFile << name << "  " << phoneNum << endl;
}

结果是：

Welcome to use the Phone Contact Systerm 
Please enter name and phone number 
Molly 5307659229
Process finished with exit code 0