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: Ugh . Another advertisement . They ' Ve added two hours of advertisements to a two hours movie .
Person2:Yeah . We ' re never going to get to the end of this one .
Person1: Why are we watching it anyway ?
Person2:Well , it does have a lot of girls in it .
Person1: True . True .
Person2:Do you think Bruce Willis just drank a Coke for his health ?
Person1: Really ? Did Coke pay him for that ?
Person2:Of course .
Person1: You want something to drink ?
Person2:Yeah , Got a Coke ?
Person1: Sure .
Person2:Hurry , the movie is coming back on .
Example Output: informal

Example Input: Person1: Do you think you will ever work at that company again ?
Person2:When pigs fly !
Example Output: formal

Example Input: Person1: Anyone home ? Jen !
Person2:I'm in the kitchen ... let yourself in !
Person1: Wow ! You're really working up a storm !
Person2:I know . I've even worked up a sweat .
Person1: You look like a cooking show host--only messier .
Example Output:
formal