Laravel 4.2 Many-to-many relationship : Can't read from pivot table

I was trying to apply Jeffrey Way's many-to-many relationships tutorial into my private messaging app but I got stuck. I'm trying to get 2 conversations, haha and hehe which are associated to a user. However, Laravel gives me the error :

Column not found: 1054 Unknown column 'Conversations.user_id' in 'where clause' (SQL: select * from `Conversations` where `Conversations`.`user_id` = 1)

I have these data in my conversations table :

+---------+----------+
| conv_id | name     |
+---------+----------+
|       1 |     haha |
|       2 |     hehe |
+---------+----------+

In my user_conversations table :

+----+-------------+--------+
| id | conv_id     | user_id|
+----+-------------+--------+
|  1 |           1 |      1 |
|  2 |           2 |      1 |
+----+-------------+--------+

1. I've tried : In controllers :

User : return $this->belongsToMany('User','id');

Conversatons : return $this->hasMany('Conversations','conv_id');

but the result I got was : haha instead of haha and hehe

2. I've also tried :

User : return $this->belongsToMany('User','user_conversations');

Conversatons : return $this->hasMany('Conversations','user_conversations');

but laravel returned me the following error :

Column not found: 1054 Unknown column 'Conversations.user_conversations' in 'where clause' (SQL: select * from `Conversations` where `Conversations`.`user_conversations` = 1)

I'm still relatively new in Laravel so I might be making some silly mistakes.

here are my codes :

MODEL

Conversations

class Conversations extends Eloquent  {

    protected $table = 'Conversations';

    protected $fillable = array('name');

    public function users(){
        return $this->belongsToMany('User');
    }

}

User

<?php

use Illuminate\Auth\UserInterface;
use Illuminate\Auth\Reminders\RemindableInterface;

class User extends Eloquent implements UserInterface, RemindableInterface {

    ....

    public function conversations(){
        return $this->hasMany('Conversations');
    }
}

CONTROLLERS

Conversations Controller

public function create()
    {
        $loginuser = User::find(Auth::user()->id);
        $conversations = $loginuser->conversations;
        return View::make('msgsystem.Conversations.Conversations',array('conversations'=>$conversations));
    }

MIGRATIONS (in function up())

user

Schema::create('users',function($table)
        {
            $table->increments('id');
            $table->string('email')->unique();
            $table->string('password',100);
            $table->string('name',150);
            $table->string('usertype',50);
            $table->boolean('block');
            $table->string('remember_token',100);
            $table->timestamp('lastlogin_at');
            $table->timestamps();
            $table->softDeletes();
        });

conversations

Schema::create('Conversations', function(Blueprint $table)
        {
            $table->increments('conv_id')->index();
            $table->string('name',100);
            $table->timestamps();
        });

user_conversations

Schema::create('user_conversations', function(Blueprint $table)
        {
            $table->increments('id')->unsigned();
            $table->integer('conversation_id')->unsigned()->index();
            $table->foreign('conversation_id')->references('conv_id')->on('conversations')->onDelete('cascade');
            $table->integer('user_id')->unsigned()->index();
            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
            $table->timestamps();
        });

Bonus points for improvement of code. Thank you very much!