Definition: 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: Ouch , it ' s unbearable .
Person2:Please keep calm . I know the pain isn ' t what flesh and blood can stand . But be brave .
Person1: All right , doctor . But it really hurts .
Output:
informal