Treating chronic diseases often involves repeated assessments from the patient's perspective to guide therapy decisions and promote quality of care. Therefore, patient-reported outcome measures (PROMs) have been established in the form of questionnaires. One promising approach for collecting PROMs are embodied conversational agents (ECAs), which have the potential to make the questionnaire completion more engaging, interactive and lower the response burden for the patient. Building on Satisficing Theory, this research-in-progress paper reports on the design and preliminary evaluation of an ECA for multiple sclerosis patients. The results indicate that such a system meets the needs of the patients and motivates a comparative study to contribute further evidence on the use and advantage of ECAs for this purpose. Based on a literature review, an evaluation approach including a research model is derived, and implications for future research are discussed.