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: He was once a poor man but now he is a man of means .
Person2:How did he make a fortune ?
Person1: He didn't make any effort . His aunt died and left him a fortune .
Output:
formal