Drift

I created account with Drift, got the Javascript code and inserted it using the embed code feature.

https://gethelp.drift.com/hc/en-us/articles/360019516313-Sign-into-Drift-with-Google

https://gethelp.drift.com/hc/en-us/articles/360019349154-How-To-Install-Drift-On-Your-Website-Using-Javascript-

Embed Code