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:       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 . 

formal