After you confirm the details of your Ad hoc meeting or send a request with your slash command, Amy and Andrew will reach out to your guest with times that work with your availability. They can easily click the time that works best for them directly in the email or select "Choose a different time" to see other options.
If your guest selects "Choose a different time" they will be directed to this page where they can find another date and time that works for them.
For a meeting with more than one guest, each participant will be directed to the calendar page to add their availability directly. They can also mark themself as optional, be removed from the meeting if they aren't needed, or add availability on behalf of other guests in the meeting.