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 , let me introduce myself . I'm your neighbor . My name is Shirley .  
 Person2:Hi , Shirley . I'm Sophie . It's nice to meet you .  
 Person1:        Nice to meet you , too .  
 Person2:Please come in .  
 Person1:        Here is a little gift for your family . It's a calendar with all the community events on it . I hope it can be helpful .  
 Person2:I really appreciate it .  
 Person1:        Since we are neighbors , if you need any help or anything , please come to me .  
 Person2:I will . Actually , I am worried so much about the security of this community because my house has been burgled twice before .  
 Person1:        Oh , don't worry about that here . There are security guards on duty 24 hours a day and they patrol all over the neighborhood . You know , they are all very strong .  
 Person2:Really ? That's good . Is there any supermarket in our neighborhood ?  
 Person1:        Of course . There is a Carrefour near the neighborhood . I'll show you there if you want to .  
 Person2:That's terrific !  
 Person1:        By the way , a party will be held for new neighbors the day after tomorrow . I hope I can see you there .  
 Person2:Yeah , and we can get to know each other at the party . 

informal