Job Interview help?

Hi I've applied for a job at starbucks about 2 weeks ago. On monday I called to ask about the status of the application and the store manager kind of gave me a mini interview over the phone, when can you start, how long would you work here, how are your hours etc. He said he would call me back I fit in his store. Anyways, I will not be in town all of next week, how do I call the employer and tell him this? Do I just say, "Hello this is Bob Jones, I believe we talked over the phone about my job application on monday, I just wanted to let you know that I wont be available for an interview if I were chosen from saturday afternoon until next sunday as I will be out of town" Can you guys help me out? Thanks :D