使用htaccess配置url

I am trying to change URL with htaccess. I have found similar questions here but they cannot work in my case.

My current url is:

website.com/find-our-office-near-you/index.php?sn=visit-our-office-in-Auburn-36801-Alabama

How i want it to look:

website.com/find-our-office-near-you/Visit-our-Office-in-Auburn-36801-Alabama

You can use the following Rule in .htaccess

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php?sn=$1 [L,QSA]

UPDATE Paste the htaccess in the same folder like below

find-our-office-near-you
    - index.php
    - .htaccess

This will use the url like

http://localhost/find-our-office-near-you/Visit-our-Office-in-Auburn-36801-Alabama

Try this:

RewriteEngine On
RewriteRule ^/?find-our-office-near-you/(.*?),(.*?)/?$ /find-our-office-near-you/index.php?sn=$1-$2 [L]