Help the unfortunate traveler explain to their boss why they missed the conference by dragging the correct verbs to the gaps.

When I finally arrived at the gate, the plane had already left. It turned out someone had stolen my luggage while I was buying a very expensive coffee!

When I finally arrived at the gate, the plane had already left.

The plane leaving happened before the traveler arrived at the gate. We use the past perfect to sequence these two past events clearly.

It turned out someone had stolen my luggage while I was buying a very expensive coffee!

The theft happened earlier in the past, before the traveler realized it ("turned out").