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:       Hello , Susan , it ’ s me , An .  
 Person2:Hi , An . How are you ?  
 Person1:        I am fine . I am going swimming this afternoon . Are you coming with me ?  
 Person2:I am afraid I can ’ t this afternoon . I take my daughter to her tennis class at the club on Wednesday afternoons .  
 Person1:        Maybe I can meet you at the club and we can play tennis together .  
 Person2:Ok , I'll meet you at the club at two thirty . 

informal