Hi {first_name},

As business owners, our time is valuable and I don't want to take up more of your time than I already have. 

If this is not a good time for you to do a book interview, or if you are simply not interested, I completely understand. Please feel free to reach out to me if you change your mind or if an hour frees up on your schedule within the next couple of weeks, and I can try to still get you on the calendar.

Thank you so much. 

{email_signature}