Final answer:
The correct form of the verb llenar that completes the conversation is llenar.
Step-by-step explanation:
The correct form of the verb llenar that completes the conversation is llenar. In Spanish, the verb llenar means 'to fill' or 'to complete.' In the conversation, the receptionist is asking Fernando to fill out or complete a form, so the correct form of the verb should be llenar.
Learn more about Completing a conversation in Spanish