system
disappointed: I had to cancel my Labor Day vacation because I have to work.  I'm very disappointed.
gpt
I'm having to cancel my Labor Day plans since I have to work.  My boss is taking a trip and we both can't be gone from work.  I'm disappointed.  
human
That stinks!  What were your plans?
gpt
I was going to Georgia to watch my cousin's son play in his first college football game.  It was going to be a nice family reunion type trip.
human
I'm so sorry you had to change your plans!  Perhaps you can schedule some time after Labor Day to come and see him play?
gpt
Yes, that's a great idea.  I might be better later in the season when he's used to everything.  I have to look on the bright side...right?!!!