Video Models:

Here is one example of a video model that depicts the appropriate response to an interruption, and several video models that depict the appropriate way to respond to questions:

Here is an example of a social interruption. Matt’s co-worker asks him if he has seen a certain movie. They chat briefly about the movie, and then they get back to work. 
This is the right way to respond when someone asks you a question at work. He looks towards his co-worker, and answers him right away. He uses a friendly tone of voice. 
This is the right way to respond when you don’t know the answer to someone’s question. He looks towards his co-worker and responds right away. He says, "I don’t know, I’m sorry." This shows that he is friendly and polite. 
This is the right way to respond when you need more time to think about a question. He looks towards his co–worker, and politely tells her that he needs more time.