C/C++ :: Login Program That Reads Username And Password From Text File

I am trying to make a simple login program that reads username and password from a text file.

In my text file I have:

name1;pass1
name2;pass2
name3;pass3
name4;pass4
name5;pass5

Everything is working okay with name1 and pass1, but if I try to log in with different credentials, for example name2 and pass2 it says "invalid details"

Here is my code:

string user, chuser;
string pass, chpass;
string los;
ifstream loginData("logindata.txt");
cout << "Please type in your username:" << endl;
getline(cin, user);

[code].....