Help Me to remove Specific Data from the txt. FIle

PLS help me line 100 - 129

That part was suppose to delete a specific data from the text file i dont know what to do

well on this code it cant delete data , but i try to make it search for the name of the specific data to be remove

PLS HELP ME
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 #include <iostream>
#include <fstream>
#include <stdlib.h>
#include <iomanip>
#include <string>
using namespace std;

struct reserve
{
    string name;
    string date;
    string time;
    string operation;

};
int main()
{
    reserve res;
  fstream myfile;

  char choice;

 myfile.open("Reservation.txt",ios::in|ios::out|ios::app);
  choices:
  cout<<"\t\t\tReservation"<<endl;
  cout<<"Choice the letter of your choice:"<<endl;
  cout<<"[A]. View Reservation\n[B]. Add Reservation\n[C]. Remove Reservation\n[D]. Exit Program"<<endl;
  cout<<"\nChoice:";

  cin>>choice;
cin.ignore(10000, '\n');


  if  (choice=='A'||choice=='a')
  {
      system("cls");
cout<<"\n\n\t\t\t\tLIST OF RESERVATION";
     string output;
     myfile.seekg(0,ios::beg);
 cout<<endl<<endl;
     cout<<left<<setw(25)<<"NAME";
     cout<<left<<setw(25)<<"DATE";
    cout<<left<<setw(20)<<"TIME";
     cout<<left<<setw(20)<<"OPERATION";
     cout<<"\n";
     while (getline(myfile, output))
  {
      cout<<endl;
	cout<<left<<setw(25)<<output;
	std::getline(myfile, output);
	cout<<left<<setw(25)<<output;
	std::getline(myfile, output);
	cout<<left<<setw(20)<< output;
	std::getline(myfile, output);
	cout<<left<<setw(20) << output;
	cout<<endl;



  }

  cout<<endl<<endl;
  cout<<"\t\t\t\t******************"<<endl;
  system("pause");
   system("cls");
  cout<<"\n\n\n \t\t\t\tT H A N K   Y O U! \n\n\n"<<endl;
  system("pause");

  }
  else if(choice=='B'||choice=='b')
  {

  system("cls");

  cout<<"\n\t\t\t\tADD A RESERVATION\n"<<endl;


        cout<<"\n\tEnter the name:";
        getline(cin,res.name);


        cout<<"\n\tEnter the date:";
        getline(cin,res.date);
        cout<<"\n\tEnter the time:";
        getline(cin,res.time);
        cout<<"\n\tEnter the operation:";
        getline(cin,res.operation);

        myfile<<res.name<<"\n"<<res.date<<"\n"<<res.time<<"\n"<<res.operation<<"\n";

        system("cls");
        cout<<"\n\n\n\t\t\t\tS U C C E S S F U L L Y  A D D E D\n\n\n"<<endl;
        system("pause");
 system("cls");
        goto choices;



  }
  else if(choice=='C'||choice=='c')
  {
  string x,del;

  cout<<"Remove:";
  cin>>x;

  myfile.seekg(0,ios::beg);

  int ctr =1;
  while(getline(myfile,del))
  {
    if (ctr==1)
    {
        if(del==x)
        {
            cout<<del;
          getline(myfile,del);
          cout<<del;
          getline(myfile,del);
          cout<<del;
          getline(myfile,del);

          ctr=0;

        }else
        {
        ctr++;
        }
        ctr++;
    }
  }

  }
  else if(choice=='D'||choice=='d')
  {
    return 0;
  }
  else
  {
      system("cls");
      goto choices;
  }





}
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