I think I made the mistake of transitioning from formal, professional replies, to casual replies over the course of 2-3 emails. I started using the persons first name as I really didn't know what else to refer to them as. The person in question always used to sign off with a full name and was asking me If I wanted to make a change to a different department . my reply mail went like:
Hey xxxx,
If the program is the same, then yeah, I'm okay with the transition to x department if I still receive the assistantship.
thanks.
Did I come off as discourteous and inconsiderate?
Need your help guys.