CurrencyEntity type has not been handled gracefully

[sanchit-ahuja]

Describe the bug
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The CurrencyEntity type in dialogy has not been handled properly. We receive a KeyError when we try to access the value key because of the presence of interval keys in the object (to and from). We need to gracefully handle these kind of types.
To Reproduce
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Expected behavior
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• Python version [e.g. 3.8, 3.9]

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