Facetime macbook air/Yosemite 10.10 is working with some of my friends and some not.

Those which I can't contact are able to contact others. What's the problem?

Hello huntera17,
If you do not have any sound on your MacBook Air, then take a look at the article below. If you open up System Preferences, go to Sounds and look at the Output to see if the Internal Speakers are selected or a different output. 
Troubleshooting issues with no audio from built-in speakers on Macs
http://support.apple.com/en-us/HT203186
Take care,
-Norm G. 

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