If you use Google Calendar, you can add an All Day Event titled "DNS" to the days you're unavailable or add a regular time-based block that spans your preferred meeting times. You can add any additional context to the title after the "DNS", for example: "DNS: Houston Conference" or "DNS: Vacation".

Please note: Clara will ignore any All Day Events that do not start with "DNS".

If you use Office 365, you can add a regular time-based block like the one below to the days you're unavailable.