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:       Mary , I think we should stop seeing each other . 
 Person2:But , Bob , we were so good together . 
 Person1:        I'm sorry but it's for the best . 
 Person2:I don't understand . We were getting along so well . 

informal