I got a job offer, but..?

I got a job offer for a position but I also have another interview lined up next Friday. How do I tell them I want to hold off until I complete the other interview? Obviously I can’t tell them straight up to wait until I complete another interview. Is 2 weeks too much time for me to tell them to wait? Should I try to move the interview date up?

I think telling the other job that I have another offer and if they could tell me whether or not I have the job would be good,right?