Block timings in google calendar as per the information given in appian platform

You can use this plugin for creating meeting in the outlook - community.appian.com/.../microsoft-graph-api-email-and-calendar-utilities

Hello mahalakshmim5743,

For google you can create an Google Calendar API and use it in Appian to send out your request. When coming to Outlook not sure if as an individual you can access the credentials required. You might have to use org details for Azure setup. You will later have to create the API required for outlook. 

I am not aware of any plugins which can do so. We can wait for the other answers as well.

What exactly do you mean with this?

Then, both services provide extensive APIs.