questionConversation

I have a one to many conversation system on the website I developped, like in forum styled website and I would like to change this system to another where user would only be able to contact the administrators. You may find the whole project on GitHub.
At the moment :
 - I have a register system but every account are the same, there is no privilege.
 - conversations are added to the MySQL table `conversations` added with title, body and author.
 - the dashboard displays all conversations.

Therefore, how should I design my website again so that this one user to administrator system exist?
I know I have to change the dashboard so that the users now only see their own messages and maybe add a new one for the administrators so that they can answer the message one user may send them. Therefore I think I might have to change the route system in app.py.

Very few users would be administrators, thus picking them from users from the backend would be solution I would admit.

Here is the register route:

# User Register
@app.route('/register', methods=['GET', 'POST'])
def register():
    form = RegisterForm(request.form)
    if request.method == 'POST' and form.validate():
        name = form.name.data
        email = form.email.data
        username = form.username.data
        password = sha256_crypt.encrypt(str(form.password.data))

        # Create cursor
        cur = mysql.connection.cursor()

        # Execute query
        cur.execute("INSERT INTO users(name, email, username, password) VALUES(%s, %s, %s, %s)", (name, email, username, password))

        # Commit to DB
        mysql.connection.commit()

        # Close connection
        cur.close()

        flash('You are now registered and can log in', 'success')

        return redirect(url_for('login'))
    return render_template('register.html', form=form)

Here is the dashboard:

# Dashboard
@app.route('/dashboard')
@is_logged_in
def dashboard():
    # Create cursor
    cur = mysql.connection.cursor()

    # Get articles
    result = cur.execute("SELECT * FROM conversations")

    articles = cur.fetchall()

    if result > 0:
        return render_template('dashboard.html', articles=articles)
    else:
        msg = 'No Articles Found'
        return render_template('dashboard.html', msg=msg)
    # Close connection
    cur.close()

And finally the route used to add conversations:

# Add Conversations
@app.route('/add_conversation', methods=['GET', 'POST'])
@is_logged_in
def add_article():
    form = ArticleForm(request.form)
    if request.method == 'POST' and form.validate():
        title = form.title.data
        body = form.body.data

        # Create Cursor
        cur = mysql.connection.cursor()

        # Execute
        cur.execute("INSERT INTO conversations(title, body, author) VALUES(%s, %s, %s)",(title, body, session['username']))

        # Commit to DB
        mysql.connection.commit()

        #Close connection
        cur.close()

        flash('Conversation Created', 'success')

        return redirect(url_for('dashboard'))

    return render_template('add_conversation.html', form=form)