Usage of avail

[Daemon99]

Can someone please tell me if the following sentences are OK?

1) Appointment is not required to avail this service.
1) Appointment is not required to avail yourself of this service.
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Non-native speaker of English
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I intend to live forever - so far, so good.

[Milanya]

avail
Verb
1. to be of use, advantage, or assistance (to)
2. avail oneself of - to make use of
http://www.thefreedictionary.com/avail

According to the dictionary the second one is correct. The expression seems very formal. You can use this expression if you are writing a formal document, but it is quite uncommon in everyday speech.
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con·text - The part of a text or statement that surrounds a particular word or passage and determines its meaning.