Yesware's Find a Time tool is available on all plans - Pro, Team and Enterprise.
The Find a Time tool can be launched from the Gmail Compose window. At the bottom of the Compose window, simply select "Find a Time" (next to Templates) to launch your calendar.
We will show the weekly view of your default calendar. Using your cursor, drag and drop to select meeting times.
Once you're ready, click the blue Insert Times option and Yesware will add the selected meeting times to your email.