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'.

Example Input: Person1: Here ' s a letter for you .
Person2:Let me see it .
Person1: Who ' s the letter from ?
Person2:It ' s a letter from UCLA about my acceptance .
Person1: Read it !
Person2:UCLA accepted me !
Person1: Really ?
Person2:I ' m not joking . I got accepted !
Person1: I ' m so happy for you !
Person2:UCLA was my second choice , but I ' m happy knowing I ' Ve been accepted .
Person1: I am really proud of you .
Person2:You have no idea how proud I am of myself .
Example Output: informal

Example Input: Person1: Hi , Mary , it ' s been a long time
Person2:Hello , my old friend . Long time no see . How are you doing ?
Person1: Well , I ' m doing okay . And how about yourself ?
Person2:Not so well . To be honest with you , I broke up with Tom .
Person1: Oh . I ' m sorry to hear that . What happened ?
Example Output: formal

Example Input: Person1: Do you sell washing machines ?
Person2:Yes . We ' re having a special sale on this machine here .
Person1: Is that a Danish machine ? The name looks Danish .
Person2:No . It ' s Swedish . Would you like me to demonstrate it for you ?
Person1: Sure . I ' d like to see how it washes .
Example Output:
formal