The interviewer is asking this question to determine why you want to work for them specifically. How you answer will inform them of your career goals, personality, and how their work environment and culture are the right fit for you. They also want to keep an eye out for any indicators that you are simply applying to every job you might be qualified for and are trying to land any job anywhere, according to your skill sets and who would consider taking you in.
Showcase your company knowledge by sharing the aspects of their organization that stand out to you. Elaborate on how their company culture aligns with the environment where you'd most likely thrive and advance your career goals and objectives. Job satisfaction should be a motivator as well. Whatever your reasons for being interested in DHL Logistics, make sure it is evident to the interviewer that you want THIS job.