Instructions: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input: Person1: Mary didn't pass the final exam in physics .
Person2:She must be very sad .
Person1: Her parents scolded her severely and she's very depressed now .
Person2:At a time like this , what she needs is a pat on the back rather than a blame .
Output:
informal