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: Good evening , sir . What's your pleasure this evening ? Your usual ?
Person2:Yes . I'm going to stay with the same , a beer .
Person1: Certainly , a beer . Here you are , sir .
Person2:Oh , darn . Look what I've done . ( Spill the drink )
Person1: Don't worry . I'll make you another on the house .
Example Output: informal

Example Input: Person1: ... I knew it . I always knew you were a lesbian !
Person2:She's my roommate , not my date . The D-man , as in dork .
Person1: Haha . Still got that great sense of humor , I see . Here's my card . I sell used cars . A car from us is a car you can trust !
Person2:Alrighty then . Didn't you use to date Sheryl ?
Person1: Sweet little lassie . Yep , broke her heart when the D-man told her he couldn't be a one-woman guy .
Person2:Oh ? I heard she dumped you . Anyway , she's right over there . Oh , Sheryl !
Example Output: formal

Example Input: Person1: What's going on here ?
Person2:We're waiting in line to get one of Master Li's Chinese couplets . I got one last year and I had good luck all year !
Person1: Master Li ? Who's that ?
Person2:He's Taipei's most famous calligraphy master ! Quick ! Get in line !
Person1: I will ! I could use some good luck !
Example Output:
informal