I have to meet my graduate school professor whom I haven't met for a long time. I emailed him to schedule an appointment, but he went for vacation. He told me he would be back this week. I am still not sure whether he is back today, how to write in email to ask politely? Thanks.
Dear Professor XXX
I just wondered if you are back from your vacation yet. Please let me know when you return so we can arrange to meet up.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.