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'.

Ex Input:
Person1: Excuse me ? Is this where I register ? I ' d like to sign up for my courses for next semester .
Person2:Yes , of course . I need your student ID please .
Person1: Here you are .
Person2:Okay , Susan . It says here that you are a business major and you are in your second year . Is this information correct ?
Person1: Yes . I do want to take some additional credits this year to get a minor in psychology .
Person2:Sure . That ' s not a problem . Do you have the list of courses you want to take this semester ?
Person1: Yeah . Here ' s my list . I ' m not sure if the class schedule will allow me to take all of them though .
Person2:Yeah , that ' s perfect . What about the subjects for your minor ?
Person1: Oh yeah ! Almost forgot ! I need to take fundamental linguistics , consumer psychology and neuroanatomy .
Person2:Wow , you are going to be busy this semester ! Okay , here you go . You are registered now , you ' ll have to make your first tuition payment before classes start .

Ex Output:
formal

Ex Input:
Person1: Hello , let me introduce myself . I'm your new neighbor . My name is Andy .
Person2:Hi , Andy . I'm Judy . It's nice meeting you .
Person1: Nice meeting you , too .
Person2:Come over and visit when you have time .
Person1: Thanks for the invitation . I will !

Ex Output:
informal

Ex Input:
Person1: Thank you very much for everything you have done for me during my stay in China .
Person2:And I must thank you again for your generous help .
Person1: The help is mutual . I must thank you to see me off . My wife and I will be looking forward to seeing you . You will come to see us , won't you ?
Person2:I promise I will take the first chance to call on you . Please send your wife with my best regards .

Ex Output:
informal