Definition: 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:  Person1:       I can't believe Mr . Fro didn't buy it . Who does that guy think he is anyway ? Bill Gates ?  
 Person2:He had a lot of nerve telling us our ads sucked .  
 Person1:        Time to order . Balista , today I want a skinny triple latte .  
 Person2:When did you start worrying about your weight ?  
 Person1:        I'm not . I just don't feel like drinking whole milk today . Why ? Do you think I'm fat ?  
 Person2:No , Jess , chill out ! 

formal