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:       How was Elvin ?  
 Person2:Hey , look . My admirer has struck again .  
 Person1:        Another note ? But how ? I didn't see anyone !  
 Person2:It's an e-mail . It says , We need to meet . I'll give you a sweet treat . It's not what you think .  
 Person1:        Uh-oh . He's heating up . What are you going to do now ?  
 Person2:You know what , I think I know who my admirer is .  
 Person1:        You do ? Who ? 

informal