system
surprised: My husband bought me a new truck. I didn't even know I was getting one. 
human
My husband just bought me a new truck out of the blue! I had no idea I was going to be getting a new one. 
gpt
Oh wow!  Are you happy about the purchase?
human
Yes! I needed a new one. The other one was falling apart. I am so excited! 
gpt
I would be too! What kind?