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 . Could I speak to Justin , please ?  
 Person2:Speaking .  
 Person1:        Oh , hi Justin . This is Karen Hepburn.We met at Chris and Jim's party .  
 Person2:Of course . How're you ?  
 Person1:        Great . Uh , Justin , would you like to see Otis Lesley on Thursday night ? He's at the Kangaroo Club .  
 Person2:I'm sorry , Karen , but I can't . I have to work late this Thursday .  
 Person1:        Oh ... that's too bad .  
 Person2:Yeah . I really like Lesley .  
 Person1:        Actually , are you doing anything on Friday or Saturday ? He's playing those two nights as well .  
 Person2:Well , I can't make it on Friday either , but I'm free on Saturday night . What time does it start ?  
 Person1:        At eight sharp.How about meeting in front of the club at about a quarter after seven ?  
 Person2:That sounds perfect.And let's go out for coffee after the show .  
 Person1:        Sure !  
 Person2:See you at seven fifteen , Saturday . 

informal