The interviewer would like to know a bit more about your longer-term aspirations within Nordstrom.
If you have hopes of being promoted or moving into another role, tell the interviewer that you look forward to the opportunity to step into that role someday, but you understand it may take several years to get there. Next, mention that you are willing to do what it takes, in the role you are hired into until you can make this transition.
"I plan to make Nordstrom my long-term home. I would like to work my way into an assistant manager position, and then into management. In three years I plan to show you, through hard work and dedication, that I am someone that should be considered for a management role."