Xena can easily accept and decline any event invitation you've received via Google Calendar.
To accept a meeting using Xena:
Say something like, “Accept 'Catch up' today at 4:30 PM.” Once Xena provides relevant meeting titles, confirm your choice by providing the number that matches the invitation you'd like to accept.
Pro tip: For best results, include multiple ways of identifying your event, such as a title and date/time.
To decline a meeting using Xena:
Say something like “Decline 'Ryan <> Maisie' at 9:00 AM tomorrow." When Xena provides options, confirm your choice by replying with the appropriate number and Xena will automatically decline the invitation.
Watch out: Xena can’t proactively decline meetings for you while you’re OOO (yet). If new meetings appear on your calendar, you will need to make another request to decline them.