How to add "Accept" and "Decline" token for the interview invite which is for Candidate?

Hi ,

 Once the recruiter schedules the interview, candidate is getting interview email notification, along with the interview time and meeting link.
Now recruiter is excepting the acceptance of interview invite from candidate as "accept" or "decline".
Now we are searching for this functionality using tokens if there is any, but we didn't find.

so please help us to find the tokens/Approach to achieve this functionality to get the response from the candidate.  

Regards

Lokesh Ampanna