Boy, that message looks familiar. I received a very similar snippy E-mail when I asked to confirm my grocery stop.
I cancelled my reservation after that, and told the TTC office staff I would rather go with a company that will be nice to me.
The all-caps thing bugs me, too. I had asked a question before I made the reservation, and got a normal E-mail in response. Then, after the reservation was made, the same woman wrote back with the whole all-caps "attitude" going on.
There are a lot of other towncar companies out there...being nice is important.