Is there any LinkedIn Rest API available to search people with first and last name?

I am not able to find anything on their developer website.

I found this url from some other question: <http://api.linkedin.com/v1/people-search:(people:(id))?first-name=bill&last-name=gates>

But when I am trying to hit this url from APIGee REST console I am getting response as 403 permission denied. I am using oAuth with my LinkedIn account.

I am currently using free account on LinkedIn, is because of that.