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: Our house is too small . We had better have a big one .
Person2:How could we ever manage to buy a big house when we are always living beyond our means ?
Person1: Shut up . You should think how to make fortunes , not look for a squabble .
Output:
informal