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: How did you first meet ?
Person2:My roommate invited both of us to dinner .
Person1: Was it love at first sight ? Did you fall in love with her the first time you met her ?
Person2:Yes ! The first time I saw her I knew we would fall in love .
Output:
informal