Want to apply for this job but I need June 30-July 2nd off for a camping trip. What do I tell them so that they don’t send me away for taking 3 days off so early on?

My girlfriend just got denied a job because she told them she needed those 3 days off for a camping trip and I don’t want the same thing to happen to me. What do I tell them that I could back up with something verifiable?