I would make the following changes, but of course this is just my VHO.

Sorry, My mistake.

I got your message saying you teach from 4:30 to 5:30, and I know that when you are working nights you are usually driving from 5 to 6, and so I got confused.

Not a problem. I'll just speak to the counselor again myself and then like I said I'll send you the details to reschedule on your own if you're still interested.

How is your day going?

BITS

Happiness is not something ready made. It comes from your own actions.