Taxi from Chengdu to Jiuzhaigou Valley and return after two days by same taxi

We, husband, wife and 7 years old boy, will arrive CD on 26/9/2014 and would like to go to Jaizhaigou by a family car/ taxi and will stay two nights and return from Jaiuzhaigou to CD on 28/09/2014. May we hire a taxi from CD to Jiuzhaigou and return by same taxi as per above dates ? If it is, would please be able to give an idea how much will cost and if you know any taxi company in CD, contact details please