How to get User- email Id from hangout in every request in Rasa

Can anyone help me with how to get user details of google chat in Rasa after Rasa<->Google chat integration? I have integrated Rasa and google chat and able to receive a response in google chat. I am trying to get the user email id of every request I received from google chat. I am not sure how to get the user object as mentioned in google chat API.

Thanks a lot

Hi, I have seen that you are able to get the user email id from can you tell me how you implement. Please reply as soon as possible.