The customer service was horrible the whole trip, from them giving us the wrong room (smoking) and then having to switch us, from them leaving dirty linens and towels along the hallways.
The hotel is new, and that is the reason it is still so nice. The clientele is not what you would expect from a Hyatt, and that may be why the service was so bad. The hotel also placed us in between rooms of teenage "anime" kids from the anime conference, which was horrible because they were screaming until 3 am, and when we asked for our room to be switched we were told the "anime" kids were scattered all over the hotel, great planning.
Then, in the morning they asked how our stay was and we told them the truth that it had been unpleasant, they made no effort to amend any of the experience. It really left us with distaste for any Hyatt in the future. There are many other nice hotels in downtown Dallas to stay instead.