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: Oh , Ralph , I heard it is very dangerous traveling in space . Disasters have happened before . If the spaceship were out of order . . .
Person2:You should be optimistic about this . Things have taken a good turn . You should remember that less than two centuries ago the dangers of train travel seemed similarly terrible .
Person1: But is it possible that travelers could be hit by meteors ?
Person2:It's once in blue moon .
Person1: What do you think is the real danger man faced in space ?
Person2:The main one is radiation . There are two sorts of radiation man must fear in space . The first is radiation from the sun , and this is particularly dangerous when the sun is very active and explosions are occurring on its surface . The second , less harmful , comes from the so-called Van Allen Belts .
Example Output: formal

Example Input: Person1: Hi , how are you doing ?
Person2:I'm fine . How about yourself ?
Person1: I'm pretty good . Thanks for asking .
Person2:No problem . So how have you been ?
Person1: I've been great . What about you ?
Person2:I've been good . I'm in school right now .
Person1: What school do you go to ?
Person2:I go to PCC .
Person1: Do you like it there ?
Person2:It's okay . It's a really big campus .
Person1: Good luck with school .
Person2:Thank you very much .
Example Output: informal

Example Input: Person1: Can I help you ?
Person2:I'm looking for a Sharp DVD Player .
Person1: Sure . Any particular model ?
Person2:Yes . The DS102 series .
Person1: Oh , I'm afraid we've sold out of those . They were really popular .
Person2:Will you be getting more in .
Person1: Yes . But not for about 2 weeks .
Example Output:
informal