Answer:
It establishes a sympathetic mood.
Step-by-step explanation:
The main purpose of having this dialogue in the play is to establish a sympathetic mood. In this excerpt, we learn that Mrs. Linde has arrived to visit Nora. We also see the way Nora behaves around her. She is kind and thoughtful. She asks questions, worries about Mrs. Linde's comfort and appears genuinely happy to see her. All of these factors contribute to the development of a sympathetic mood.