Looking on the internet deeply has found these results:

I'm glad I available of your services. is the most popular phrase on the web.

I'm glad I availed your service. 125,900,000 results on the web	I'm glad I available of your services. 1173,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
You know I'm always at your service. If you're ready, I'm at your service. Of course, I'm absolutely at your service. I'm going to guarantee that you hold your services. Then I'm at your service. After that, I'm at your service. Whatever you need, I'm at your service.	We've need of your services. Then really I have no more need of your services. The East India Trading Company has need of your services. Not even an acknowledgment of your service. To be provided upon completion of your services. Since his divorce, he's in great need of your service. Yet you seemed very eager to take this meeting with me, so I'm quite sure that Peter Talbott's not the only rich man to avail himself of your services. That would be the full extent of your services.

I'm glad I availed your service.

125,900,000 results on the web

I'm glad I available of your services.

1173,000,000 results on the web

More popular!

We've need of your services.
Then really I have no more need of your services.
The East India Trading Company has need of your services.
Not even an acknowledgment of your service.
To be provided upon completion of your services.
Since his divorce, he's in great need of your service.
Yet you seemed very eager to take this meeting with me, so I'm quite sure that Peter Talbott's not the only rich man to avail himself of your services.
That would be the full extent of your services.