[escapologybb]

^This

Siri was essentially a curiosity for me until they allowed me greater control over the device, but I use my iPhone in exactly the way you've just described.

Along with "am I meeting with my physiotherapist today?", and "arrange an appointment with my doctor, physiotherapist and partner" at which point Siri creates the appointment in the calendar and sends an email invite to the parties mentioned. Assuming those people are in your contacts obviously.