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: Lester , you are really fantastic at automobile repair .
Person2:Thanks , June . But I think I need to be certified as a mechanic before I ' m allowed to repair cars for a living .
Person1: That ' s not a big problem . There are many small schools for adults like you who can study to be certified .
Person2:I guess I never thought of that before .
Person1: And you can easily get a student loan from a vocational school , or from the government .
Person2:Wow , you ' Ve inspired me to do something !
Example Output: informal

Example Input: Person1: I don't think we come here at a right time .
Person2:What's wrong ?
Person1: The museum doesn't open today .
Person2:What a pity !
Person1: Where shall we go now ?
Person2:Why not have a visit to the zoo ?
Example Output: informal

Example Input: Person1: Hi . You enjoying the party ?
Person2:Yes , actually . I don't really know anyone , but it's a nice place . Are you having a good time ?
Person1: Yes . The drinks are very good ! I'm Paul , by the way .
Person2:Hello Paul . I'm Jane . So what do you do ?
Person1: I'm in finance . You ?
Person2:Really ? Me , too . I work for an accountancy company , T & D . Maybe you've heard of them .
Person1: T & D ? Oh , yes , sure . How long have you worked there ?
Person2:About two years . And you ? Are you based here ?
Person1: No . Actually , I'm based in Shanghai . I'm just here for the conference . So , T & D eh ...
Example Output:
informal