I have used some third party tools such as nintex workflows where users can send and email with a keyword approved or yes and the workflow gets approved and status field gets updated.
can i do the same with Microsoft flow ?
Yes , you can do the Lazy Approval Workflow using Flow. I did it in one of our project. I have tested it in Exchange Web version, not in Outlook desktop version.
Yes, you can do that using a MS Flow.
You can add a condition to classify the keyword value and then start an approval request based on the value.
An official article for your reference:
Create an approval request