Travel agents occupy a curious position in the modern world — clients could theoretically book everything themselves online, but they come to you because they don't trust the internet to sort out the complicated parts. The vocabulary in this exercise is the language that justifies that trust: the precise terms for fares and fare classes, booking conditions, visa requirements, transfer types, and accommodation categories. Getting this vocabulary right isn't just about sounding professional — it's about actually giving clients the right information. A travel agent who misuses terms like connecting flight, open jaw, or ATOL protected isn't just confusing; they're potentially creating a serious problem for the person sitting across the desk.