case 4: //occurs when user inputs 4 in the 5 options given previously
                                {//Opening curly brace
                                    string input;// Declaration of this variable
                                    cout << "Hi there! I am CALE (Chatbot At Library Education), what can I help you with?" << endl ; //inserts new line and flushes stream, is displayed when user inputs 4
                                    while (input=="exit" );//Entry-controlled loop statement which allows user to to go back to the beginning when input "exit"
                                    {//Opening curly brace
                                     cin >> input ; //Prompts user to input "input"
                                    std::string sInput = ""; //input user concern here
                                    cout << "Okay! your concern is noted, Please wait for our library admin to get in touch with you soon. Thank you!" << endl ; //inserts new line and flushes stream
                                    }//Closing curly brace
                                }//Closing curly brace
                                        break;//Separates the execution of statements per labeled case so that there is no "fall-through" into the other statements 

    std::string line;
    while (std::getline(line) && line != "please exit") {
    }