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 , Dave . This is Zina . 
 Person2:Zina ? Zina the Snake ? 
 Person1:        I got your e-mail a couple of months back . 
 Person2:Yeah ? Which one was that ? 
 Person1:        The one that said , You're a creep . From me you won't hear another peep . I hope you wreck your jeep . 
 Person2:Right . That one . Did it work ? 

formal