Problem: A journalist calls to the office and you are not prepared!
Solution: First of all, find out if you are the right person they search before you start answering questions. If they want to talk to you, then it's important that you write down the questions on a piece of paper, if you don't know the answers you can ask the journalist to call back in 15 min - now you have a lot of time to prepare.. But don't forget to call the journalist back!
One other thing to keep in mind are things that you are not allowed to discuss to the public! It's easy to forget when you are just talking. Maybe make sure to discuss any key issues with your boss before you call the journalist back, just to make sure there have been no changes to the secrecy of projects, etc.
SvaraRadera