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: Hey , Jordan , is that you ? Long time no see !
Person2:Oh , hey , no kidding ! I haven't seen you since orientation three months ago ! So how've you been ? Settling into college life OK ?
Person1: Yeah , I think so ! I pledged Phi Iota Alpha , so I'm living at the frat house now .
Person2:Oh , so you're a frat boy now , huh ?
Person1: Yeah , yeah , I know , it's totally cliche , but really , I think it's been a good decision . I've got a lot of support and good suggestions from the guys . What about you ? What have you been up to ?
Person2:Not much . I'm still living at home and commuting to school . I ended up dropping that metalworking class I was so excited about . It just wasn't as interesting as I'd hoped . The guidance counselor suggested that I focus on my prerequisite courses so that I can make sure the credits count .
Person1: That sounds smart ... but kind of boring .
Person2:Yeah , it is , a little bit . I joined the Great Outdoors Club , though , which has been a lot of fun . We've gone on two camping trips already , and I've made some good friends .
Person1: That's cool . Hey , so have you decided on your major yet ?
Person2:Definitely pre-med . What about you ?
Person1: I still have no clue ... but we don't have to declare a major till our sophomore year , so I've got time ! Oops , I'm late for class . Gotta run !
Person2:OK , take care ! Hey , nice running into you !
Person1: Yeah , you too !
Example Output: informal

Example Input: Person1: Do you know how to go to the Fragrant Hills in Beijing ? I heard that they are very famous in China .
Person2:Yes . Especially in autumn , the red leaves of the maple trees make the whole mountain red .
Person1: That must be very beautiful .
Person2:Yes , it can make people feel as if they were in the land of fairies .
Person1: Really ? Have you ever been there ?
Person2:A couple of times .
Person1: Can you go there with me ? I'd like someone who is familiar with that area to go with me .
Person2:Sure . I'd be very glad to be your tour guide .
Example Output: informal

Example Input: Person1: What are your hobbies , Mr . Green ?
Person2:I like collecting stamps .
Person1: But it's an expensive hobby , isn't it ?
Person2:Yes , you're right . What do you like to do in your spare time ?
Person1: I usually play chess with my friends . But I like playing basketball best .
Person2:Do you play basketball well ?
Person1: No , I'm not very good at it . I play just for the fun of it .
Person2:Shall we have a game together some day ?
Person1: OK , that'd be very nice .
Example Output:
informal