system
A chat on subreddit /r/NoStupidQuestions
human
OP specifies polite and formal. Both of those usually involve pleasantries like being apologetic. And especially in situations like this, being apologetic doesn't necessarily mean taking personal responsibility and often just means that you are acknowledging that the person will be dissatisfied... like "unfortunately, your mother passed away" doesn't have to mean "I'm sorry I let your mother die".
gpt
In fact, the apologetic tone sometimes makes the "this is a thinly veiled 'fuck off'" land better somehow