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 here .  
 Person2:Hello , Jack . It ’ s Mary . What are you doing in your office ?  
 Person1:        I ’ m working . I often work late on Thursday . I ’ m busy this week .  
 Person2:Would you like to come and have dinner with us on Friday ?  
 Person1:        Tomorrow ? No , I am afraid I won ’ t be able to . I ’ m going on business to Birmingham .  
 Person2:What about Saturday ?  
 Person1:        Sorry , I never go out on Saturday evening . I always watch football on Saturday evening .  
 Person2:Will you come round next Tuesday ?  
 Person1:        Next Tuesday ? Just a moment . It will be the twenty-first of May ? Oh , dear . Hum , I promised my aunt I ’ ll be at her birthday party .  
 Person2:What do you say next Wednesday then ?  
 Person1:        Let me see . Yes , Mary . Let ’ s make it next Wednesday .  
 Person2:Okay . Bye .  
 Person1:        Bye . 

informal