Your description for the project is a little vague. However, I understand that to keep your ideas safe it's intentional. However, it makes it difficult to put a price / timeframe on the completion.
A personal assistant from what I can imagine will be the ability to save appointments and other need-to-be reminders that will push notifications to the end user? If so, that's what I've based my bid on.
If you would like to chat further don't hesitate to contact me. I can deliver this project for you.
Thanks for considering, Danny.