Imagine the main characters meeting in a dark, spooky parking lot and having their dialogue right there. When listening to the reverb of the voices and the spooky ambiance, it will sound like a parking garage.
If this movie is dubbed, the voice actors aren’t flying to the same location to record the scene. They are standing in a soundproofed studio booth and the sound engineer uses a convolution reverb to match the sound with the scene.
If the location sound recordist who worked on set has recorded the room tone and the impulse response, it would be perfect for the sound designer to use. This means they can later use this effect to make the voices, footsteps, or a car door closing sound authentic to the space.
I know there are some very expensive convolution plugins like Altiverb out there that cover almost everything, but not everyone has $600 or $1000 to spare on a plugin like this. If you’re an Ableton user, you can download it for free on their website and use it either with your impulse response or one of the 200 presets.