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:       I'm sorry , Sam . I don't want to go to the folk concert .  
 Person2:How about going to the theatre ?  
 Person1:        I don't like going to the theatre .  
 Person2:Well , what do you like doing ?  
 Person1:        Travelling , swimming , going to the cinema . And you ?  
 Person2:I like painting , sailing , watching football and talking to you .  
 Person1:        I like talking to you , too .  
 Person2:Do you want to go to an exhibition ? There is one at the Xinghai Exhibition Hall tomorrow .  
 Person1:        That's a good idea . 

informal