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:       Paul , what kind of music do you like to listen to ? 
 Person2:All kinds , but mostly Pop , rock and classical . Why ? 
 Person1:        I have tickets to a show . Do you want to go with me ? 
 Person2:What kind of music is it ? 
 Person1:        Pop . It's Maria Carey . 
 Person2:When is it ? 
 Person1:        At 8P M tomorrow night . 
 Person2:Yeah , I'd like to go . Do you think we should have dinner first ? 
 Person1:        Yes , that's a good idea . 
 Person2:Let's eat at the restaurant across the street from my apartment . 
 Person1:        Oh , I think I know the place you mean . We ate there last month , right ? 
 Person2:Yes , that's right . You have a good memory . 

informal