Auto-response verbiages (Utterances) can be updated in the following link:
Here you can update your automated responses, just make sure to click on save (at the top right-hand corner) anytime an update is completed.
Adjusting Business Hours and Holidays
In the same link as above, click on the business hours tab. Here you can update your organization’s business hours and Holiday’s calendar.
Make sure to click on "Save" any time an update is done in any of these sections.