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 am working . I often work late on Thursdays . I am busy this week . 
 Person2:Would you like to come and have dinner with us on Friday ? 
 Person1:        Tomorrow ? No , I'm afraid I wouldn't be able to . I'm going out of the town on business . 
 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 21st of May . Oh , dear . Arm ... I promised my aunt I would be at her birthday party . 
 Person2:What do you say to next Wednesday then ? 
 Person1:        Let me see . Yes , Mary . Let's make it next Wednesday . 
 Person2:Ok . Bye . 
 Person1:        Bye . 

formal