I want to extract reviews from public facebook pages like airline page, hospital page, to perform sentiment analysis. I have app id and app secret id which i generated from facebook graph API using my facebook account, But to extract the reviews I need page access token and as I am not the owner/admin of the page so I can not generate that page access token. Is any one know how to do it or it requires some paid service? 
Kindly help.
Thanks in advance.
Without a Page Token of the Page, it is impossible to get the reviews/ratings. You can only get those for Pages you own. There is no paid service either, you can only ask the Page owners to give you access.
How to extract reviews from facebook public page without page access token?