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:       Steven , have you any friend in London ? 
 Person2:Yes , my old friend Hanson lives there 
 Person1:        Are you close ? 
 Person2:Yes . He's one of my best friends . Our friendship formed at college . Why did you ask that ? 
 Person1:        I'm going to London on business next week . But I know nothing about it . 
 Person2:I get it . You want to find a guide , don ’ t you ? 
 Person1:        Yes , Steven . You always know what I want . 
 Person2:Don ’ t worry . I will call Hanson , and ask him to help you . 
 Person1:        Thank you ! 

informal