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:       An interesting meeting , isn't it ?  
 Person2:Yes , very . I thought the last speaker was especially good .  
 Person1:        Let me introduce myself , by the way . My name's Thomas Bradley .  
 Person2:How do you do ? I'm Ted Nugent .  
 Person1:        Sorry , what was your last name again ?  
 Person2:It's Nugent , N-U-G-E-N-T , but just call me Ted .  
 Person1:        Ok , I'm Tom .  
 Person2:Glad to meet you .  
 Person1:        And what do you do , Ted ?  
 Person2:Me ? I'm in the car business .  
 Person1:        Salesman ?  
 Person2:Yes , that's right . And how about you ?  
 Person1:        I work for American Airlines .  
 Person2:Oh , really ? What do you do there exactly ?  
 Person1:        I'm in the Personnel Department . 

informal