Clara will try to schedule the call during work hours for both you and your international contacts (unless you specify otherwise). Use a Standard Codeword to expand your preferred meeting times for international timezones that may pose an timing issue.
Please note that Clara will not be able to determine if a participant is "international" from their domain or email signature. You will need to tell Clara the the meeting to be setup is for an international group.
"Clara, please find time for me to chat with Matt (who is in London)."
"Looping in Clara to find a time for this international team to talk."