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: Good evening . Welcome to our program .
Person2:Thank you . Good evening , Mr.Dean .
Person1: Would you tell us your name , please ?
Person2:I'm Helen Baker .
Person1: Glad to meet you , Ms.Baker .
Person2:Glad to meet you , too .
Person1: Where are you from , Ms.Baker ?
Person2:I'm from New Zealand .
Person1: What do you do for a living ?
Person2:I'm a teacher .
Person1: Thank you for coming , Ms.baker .

Output: informal

Input: Consider Input: Person1: Did you vote yesterday ?
Person2:I sure did !
Person1: What candidate did you vote for ?
Person2:I voted for Obama .
Person1: I ' m shocked he actually won .
Person2:I knew he would win .
Person1: How ' d you know ?
Person2:He was the best candidate this year .
Person1: What about him being black ?
Person2:I guess America is finally maturing .
Person1: I think you have a point .

Output: informal

Input: Consider Input: Person1: Ouch !
Person2:Are you all right ?
Person1: Yeah , I just bumped into the table .
Output: informal