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: I am trying to decide what school to apply to ?
Person2:Are you thinking about a public school or a private one ?
Person1: I am not sure . What's the difference between them ?
Person2:Public schools are usually state funded , whereas private schools usually get their funding elsewhere .
Person1: Which is better ?
Person2:One isn't necessarily better than the other . It depends a lot on the school administration and the teachers .
Person1: I hear you have to wear uniforms at private schools .
Person2:Yes , sometimes .
Example Output: formal

Example Input: Person1: How much do you expect to earn ?
Person2:I think salary is closely related to the responsibilities of the job . Shall we discuss my responsibilities with your company first ?
Person1: If you are hired , you are in charge of the design of toys that can meet the needs of the American market .
Person2:I know it is a crucial position , but I can do it well . So I'm asking for 200,000 Yuan a year as a starting salary .
Person1: Ok .
Example Output: formal

Example Input: Person1: Welcome to my birthday party , I am so happy you can come .
Person2:Thanks for inviting me . Here is the gift for you . Happy birthday , Francis ! Many more happy and healthy years for you !
Person1: Thank you , shall I open it now ?
Person2:Yes , please do .
Person1: Wow , a remote car model and my favorite brand . I really like it . That is so nice of you .
Person2:Yeah , I was really struggling whether I should give you this nice little car . It was the last one they had and I really like it so much myself .
Person1: Typical you , always wanting to keep the best things for yourself . The more I appreciate the gift now .
Example Output:
informal