In this episode of the Business English Podcast, the hosts delve into the right phrases to use when a receptionist informs you that the person you need to speak with is unavailable. They cover a range of scenarios, from urgent situations that require immediate attention to more casual inquiries. The discussion highlights the importance of being polite and provides several example phrases, illustrating the differences between leaving a message and calling back later based on the urgency of the matter and how much control you want over the communication. Additionally, they explore the subtle distinctions between phrases like "Do you know?" and "Do you happen to know?"