Addendum: I am in Vietnam from Australia on a 2 week business trip. I came here to meet with Company A, which I did on my first week of coming up here (last week Friday). Four days after meeting (Tuesday), the Founder emailed me the following e-mail:
Are you still here until Friday this week? What is a good time to catch up with each other?
to which I (naively) replied:
I trust you’re well. I'm fully committed over the next 2-3 nights before I fly out, but would love to catch up on my next visit.
My plans have changed, and thereby now I am able to meet up, especially since I don't have to come in to work on Saturday and go directly to the Airport.
TL;DR: My plans have changed, now I'm able to meet up.
Q: How would I professionally and politely phrase this?