This si the reason the first paragraph often summarises the good news. The indirect approach on the other hand, calls for a more inductive method, where the end is proven, instead of stating it right away. It is used for negative reports, where explanation that leads to the negative end is adopted.
Secondly, one must see whom it addresses. If it is written to a higher up, it must be written in indirect approach, since it is generally written in undertone and polite, instead of sounding too direct or bombastic.
Thirdly, the kind of structure to be followed determines the approach to be adopted. If an explanatory and then a conclusive answer is the preferred idea, then the indirect approach is to be adopted. Meanwhile, for direct statement of the idea, the direct approach is appropriate.
In the mentioned scenario, the direct approach would be a risky one, since it would sound too impolite and direct. The indirect approach would be best suited for the situation.