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Create a reminder from a conversation in Messages on Mac
When a message contains a request to do something at a particular time (for example, βCall me at 6:00 pmβ), you can create a reminder.
In the Messages app
on your Mac, select a conversation.Look for the message with the request, then Control-click the underlined text and choose Create Reminder.
A reminder is also created automatically when someone asks you to do something (for example, βCan you get milk tomorrow?β) and you provide an answer (such as βYesβ or something similar). The suggested reminder appears in the Reminders app 
in Siri Suggestions.