How to open Facebook Messenger and direct to someone?
<p>I have FBSDK already and can use FBSDKShareKit send something on Messenger.
I want just open a chat with someone in Facebook Messenger. like this:</p>

<ol>
<li><p>Click a button in my app(sample: Facebook app):
<a href="https://i.imgur.com/j60P3Ng.png" rel="nofollow noreferrer">http://i.imgur.com/j60P3Ng.png</a></p></li>
<li><p>Go to Facebook Messenger and open a chat with this person:
<a href="https://i.imgur.com/yU0EXKF.png" rel="nofollow noreferrer">http://i.imgur.com/yU0EXKF.png</a></p></li>
</ol>

<p>How Can I do it?</p>