The only agency I have dealt with in Calgary was Sweet Escape.
It was good and I was very happy with the service. It`s been over 1 1/2 year though and I can`t remember the name of the girl, I think it was Audrey or Ashley or something like that. Service was , DATY and DFK on the menu. It was pretty expensive; $280 / hour, but worth it for the city.
Flyguy