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I have saved so much time scheduling calls or meetings because of no back and forth using http://assistant.to
It is simple to use with Gmail along with Google Calendar. And it is free to use.
If you don’t want to be limited to just Gmail nor picking times yourself that would work for you in the future, I have saved even more time by allowing people to schedule time with me based on my calendar availability for Zoom.us calls using calendly.com.
The combination of zoom for calls and calendly.com save countless hours each week.
Yes, if you really want to discuss something productive for 15 minutes with me, schedule the time here and you will see what I mean.
There are some other appointment scheduling apps available if you prefer to do your own research.