cognitoUser.forgotPassword({
        onSuccess: function (result) {
            console.log('call result: ' + result);
           //Show login screen
        },
        onFailure: function(err) {
            alert(err);
        },
        inputVerificationCode: function() {
            var verificationCode = prompt('Enter the code from email' ,'');
            var newPassword = prompt('Please enter new password ' ,'');
            cognitoUser.confirmPassword(verificationCode, newPassword, this);
        }
    });