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 , Jack ! Fancy meeting you here !  
 Person2:Yes , it's really a surprise . How are you ?  
 Person1:        Fine . How is Jim ?  
 Person2:Oh , he is all right . But busy as usual . Well , why don't we have a good chat at a bar ? It's been long time since we met each other last time .  
 Person1:        Good idea ! 

informal