extract of (Key,Value) Pairs from Unstructured text

What is the best way to extract of (Key,Value) Pairs from Unstructured text. Example: like extract relevant data from OCRéd text from Airline Boarding pass, Hotel Bill, etc ?
Any built-in algorithm available ?
Attached one document and like to know is it doable by any existing ML library/package.
Thanks in Advance

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Yes. Definitely doable. However, the accuracy depends a lot on available training data specific to the domain. This problem could also be looked at using Deep Learning techniques.


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