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:       Tell me about your brother and sister , Sue .  
 Person2:Well , my sister is a lawyer .  
 Person1:        Really ? Does she live here in Seattle ?  
 Person2:Yes , she does . But she's working in Washington , D . C . , right now . Her job is top secret .  
 Person1:        Wow ! ! And what does your brother do ?  
 Person2:He's a painter . He's working in Argentina this month . He has an exhibition there .  
 Person1:        What an interesting family ! 

informal