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:       Hi , my name is Pete . You are Ann . Isn't that right ?  
 Person2:Hi Pete , how do you know my name ?  
 Person1:        Do you see that girl in the red top ? She told me who you were .  
 Person2:Oh Andrea , the Spanish girl ?  
 Person1:        Yes , that's her .  
 Person2:I met her last week at a party . Anyway , you must be from the United States ?  
 Person1:        Actually I live in London , but my family lives in Seattle .  
 Person2:Oh , I am from London as well .  
 Person1:        Where in London do you live ?  
 Person2:In Wimbledon - quite close to the tennis courts actually . Which is very nice because I love tennis .  
 Person1:        I play tennis there every week . Shall we have a game one day ?  
 Person2:That would be lovely . But now let's go and get a drink . 

informal