You play one of the two main roles. In the film, you accompany a wheelchair user (assistant) through his everyday life. You speak a set interview part directly into the camera (in a modern office setting) and act in various B-roll situations (in an apartment and in the park on a walk) with your partner.
This is what you need to play:
Confident, professional demeanor in the interview setup.
Natural laughter, relaxed conversations and small handouts in everyday life (making coffee, accompanying a walk).