You can let Amy and Andrew know who is optional via email on ad-hoc meetings or on my.x.ai. Optional participants won’t need to confirm a time, but they will get the final invite once the meeting is scheduled.
You can cue Amy and Andrew on optional attendees like this for an ad-hoc meeting:
"Andrew, schedule a call next week. Brian is optional."
Additionally, you can also set a guest to be optional on your meetings page on my.x.ai. Just click into the meeting on your dashboard and then click on the edit icon next to your guest’s name. There you can set a guest to be required or optional with a click.