https://www.theverge.com/2018/5/24/17388564/apple-patent-siri-phone-call-smart-replies

Apple is exploring ways that Siri could play a helpful role in explaining why you had to decline a phone call. As AppleInsider notes, a new patent shows that by factoring in context (such as your iPhone’s location or whether Do Not Disturb is enabled) and analyzing who the call is from, Siri might be able to produce custom responses that are more specific to your current situation than the canned messages you can send now when rejecting a call.

Images in the patent application show Siri pulling from Apple Maps and suggesting a smart reply that includes the street you’re on and how long it’ll take to reach your destination. That could be useful if you’re running late for a week meeting or dinner plans. Another identifies the caller’s boss and presents similar location-based responses — but without mentioning “home” as it did in the other conversation. Apple shows several examples of the feature that involve CarPlay.