To make a check-out appointment, Carefully pattern everything about your request after this example at right.
NOTE:
Header = Chemistry check-out appointment requested
Professor name, date starting, room number, date leaving.... EVERYTHING as it is in the example. 

Provide in your request:
two or three 15-min times
at least four business days in the future,
on at least two different days
after checking my calendar to see when I am available.

In this way it is usually possible to get everything set up with only one email from you to me, and one reply from me to you.     (Work area checkout page, samples list....)