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:       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 . 

informal