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: You won one million yuan in a lottery . What will you say ?
Person2:I don't know . I'm too excited to say a word .
Person1: I understand . It's too good to be true , isn't it ?
Person2:Yes , too good to be true .

Output: informal

Input: Consider Input: Person1: Lisa , I'm home .
Person2:How was your day ?
Person1: Pretty good . I've made a few friends already .
Person2:Anybody I know ?
Person1: Well , Pam Franklin lives next door to us . By the way , can I go to her house this Saturday ?
Person2:Of course . You didn't have to ask me .
Person1: That's what Pam said .
Person2:Just don't stay out too late .

Output: formal

Input: Consider Input: Person1: Do you mind if I ask you a question ?
Person2:No , not at all . Go ahead .
Person1: What do you do in order to improve your English ?
Person2:I go to movies ; I go to lectures ; I listen to the radio ; I do lots of things . Most importantly , I practice every chance I get .
Person1: It ' s a good idea to have a radio , isn ' t it ?
Person2:Sure . It ' s like understanding on the telephone you can ' t see the speaker ! It ' s great for improving listening comprehension .
Person1: It takes a long time to learn a language , doesn ' t it ?
Person2:It certainly does . But if you practice speaking every spare minute and learn useful sentences every day you can make big progress .
Output: formal