Aren was shocked to say the least, he honestly didn't expect anything let alone an invitation to the Dance from her. It took him a little while to get his head around it (and be sure he hadn't somehow slipped into a dream state, and yes he checked it wasn't a prank either).
Text;
I'd like to accept you invitation to be your date to the dance.
It'd be my pleasure to be your date to the dance.
Hi, this is Aren, just wanted to let you know I accept your invitation.
Hey Chelsea, thanks for the invite; Just a fair warning- I can't dance very well.