Amy and Andrew will schedule with everyone's time differences in mind, so long as they know where everyone is located. Let them know where your guests are located, and they’ll communicate with your guests in their local timezone; however, Amy and Andrew will always send the invite out with your timezone as a point of reference. Just let Amy and Andrew know where your guests are located when you send in your initial meeting request.
“Amy, please find time for a Skype call later this week. Samantha is in London”
“Happy to get on a call! Andrew, find a time next week for us. Sally’s in China”