Walmart Department Manager interview questions

Interview was with an assistant manager who basically asked me why I wanted the job and what I was willing to do to make the department successful. Then she asked the typical interview questions: tell me about a challenging situation, how do you deal with conflict, tell me about a time when you were stressed and how did you deal with it, etc...

Was called into the ad office, having no ideal why and when I walked in three asst. mangers were sitting with notepads in their laps. One of the managers said we called you to interview you for a Dept. mangers position. I was not prepared for an interview that day and it was the worst interview I've every had. The questions they ask were easy but after my phone ringing and having a bad day prior they seemed like they were difficult to answer.