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.