I had a good experience working with you, and my guests enjoyed the meal and interacting with you. You were very responsive in working with me to develop the menu, and were very punctual. I would use you again and can recommend you to others.
On the constructive criticism front, I would suggest providing a little more detail about the menu items, and providing early confirmation on the event date that things are on track, etc. I don't use catering services often, so I don't know what the typical practices are. However, in my business life, I am accustomed to receiving (and giving) such specifics and confirmations so that my clients don't have to make assumptions or otherwise wonder where things stand.
That said, I want to reiterate that I had a good experience, and I thank you for your service.