How to relate Banners and Services table on Laravel 5.x project

I'm trying to relate two tables on my Laravel 5.x project. One is Banners table and the other is Services table. I can't figure out which Eloquent relation i should use.

On my homepage carousel slider, each of the Banners should represent one of records from the Services table. The only thing i need from Services table is the value of the 'slug' column related to the service.

I thought i can relate two tables by using a 'service_id' column on Banner model pointing to the 'id' column of Service model. Then using that relation to retrieve 'slug' value from Service model.

At first i tried this on Banner model:

public function services() {
    return $this->hasMany('App\Service');
}

and retrieve the value using:

$slide->services->slug

but this did not work. Then i tried using 'belongsTo' method instead of 'hasMany'. It did not work either.

I have no idea which eloquent relation and how to use it. I'm open to all suggestions.

via Chebli Mohamed