Négation avec article indéfins

Pooja, no the translation is not correct. As ‘ne . .  pas’ is followed by a prepositional phrase, it remains ‘…. pas dans un bureau’. 

You need to dig down to responses from 2 years ago by Chris and me, but this is also discussed in ‘Questions’ under the attached lesson.

 Du/de la/de l'/des all become de/d' in negative sentences (French Partitive Articles)