We would like to book a car and driver for 2 days in Jiuzhaigou September.

Based on my experience, I’d like to recommend you with the eHi Cars Service. They have the English official website for foreign visitors. As the specific price, you may consult them by the hotline 400-888-6608 because different routes have different prices.

There is no rental car service at the airport. Closest car rental "ShenZhou Car Rental" is 10km away, and speaks chinese only, and offer van only. No taxi driver would want to take you there.

Also You will need to go through the temp driver license application in major airport like Beijing, international drive license is not allowed. It took me 1.5 hours, running up and down 1st, 2nd, 4th floor.