Hints for the speech recognizer to help with recognition
in a specific conversation state.
Optional. Boost for this context compared to other contexts:
* If the boost is positive, Dialogflow will increase the
probability that the phrases in this context are recognized
over similar sounding phrases. * If the boost is unspecified
or non-positive, Dialogflow will not apply any boost.
Dialogflow recommends that you use boosts in the range (0, 20]
and that you find a value that fits your use case with binary
search.