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Dear Nikita,

You 're absolutely right! It's not Urophora cardui, which has a different wing-pattern. The species with the kind of wing-pattern as photographed are abundant in the Palearctic, and very difficult to identify. To be sure you should extract the aculeus of the female and look at its apex, the last 0,1 mm!
One of the most common species, at least here in Europe, with this kind of wing-pattern is U. solstitialis. But since I can't have a look at the aculeus, you'll never be sure about it.

Best wishes,

John Smit