Build a reusable email template

I send the same kind of email often: [TYPE OF EMAIL, e.g. 'quote request', 'meeting reschedule'].

Here are two real examples (remove any private details first):

[PASTE EXAMPLE 1]

[PASTE EXAMPLE 2]

Create one reusable template with [BRACKETED] fields for the parts that change, a short list of when to use it, and one line I can tweak to keep it from sounding canned.