When use 您 in spoken language?
Basically it is know that 您 is polite and 你 is more familiar. But in coursebooks I often see situations like that: for greeting use 您好 but in further conversation people switch to 你. A friend of mine who learned in China for a long time and her Chinese far more superior than mine said that it's better to use 你 in spoken language and people can even be offended if 您 used in addressing them. And in written language 您 for addressing older or respected or unknown person is obligatory.
In written language situation is somewhat clear, but how do I use 您/你 in everyday conversation?

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您 is more formal than 你，we use 您 when speak to older, client. And in north of china, people use more 您 than in the south of china

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I meet people who refuse to stop calling me 您 no matter how much I protest.  Even with friends (typically female friends - male friends aren't such sticklers for 'respect').  Even with people older than I. It is clearly a respect convention, and may be acknowledging age or position.  Use 您 with aging/aged or high position.  If in doubt, use it and observe the reaction.  Drop it when you feel you can or should.

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您 compare with 你，您show more your respect,and offical than 你，so people in china use 您 when they talk to the people older than them /when u write a letter to your teacher /  u can use 您 in  anytime u want to show your respect 。

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I only use 您 when talking to seniors.
Anyone who works in service industry can also use 您 when talking to clients.

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