I'm not great at tracking prices after booking, so this is my first time attempting this. I have a one-way flight scheduled later this month (regular economy, booked on united.com) and the price has dropped. I tried choosing the option to change the flight, and the same flight appears, but it says that regular economy isn't available, but I can switch to fully refundable economy plus a $9 travel credit. If I choose the fully refundable option, then cancel for a refund, will I anger the UA gods if I then book the exact same flight at the lower price?