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: Consider Input: Person1: Your knowledge of English is really surprising .
Person2:Oh , it's nothing to speak of .
Person1: No , seriously . I am impressed .
Person2:Thank you . I appreciate the compliment .
Person1: Your knowledge of English is really surprising .
Person2:Oh , it's nothing to speak of .
Person1: No , seriously . I am impressed .
Person2:Thank you . I appreciate the compliment .

Output: informal

Input: Consider Input: Person1: You ready ?
Person2:Am I ready for what ?
Person1: Are you ready to transfer to a new school tomorrow ?
Person2:Oh . Yes , I ' m ready to transfer .
Person1: You ' re not nervous , are you ?
Person2:I ' m very nervous .
Person1: Why are you nervous ?
Person2:I ' m not going to know anybody there .
Person1: That ' s not a problem .
Person2:That makes me nervous .
Person1: It ' s fun meeting new people .
Person2:I didn ' t think about it that way .

Output: formal

Input: Consider Input: Person1: Hey , Dora ! What kind of books do you like to read ?
Person2:I read everything I can get my hands on but I like love stories best . What do you think about the love stories ?
Person1: I hate to tell you this , but they are nothing but sob stories .
Person2:I don't think so . I like them . Then what's your favorite book ?
Person1: I'm fond of history books .
Person2:Oh , the history books are dull to me .
Output: formal