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:       Hi , Sara , what are you reading ?  
 Person2:Hi , John , I am trying to find a carpenter .  
 Person1:        Why ?  
 Person2:Well , I want to build a deck in my back yard .  
 Person1:        What for ?  
 Person2:So I can have a special place to hang out with friends , and also do some barbecuing on weekends .  
 Person1:        That sounds cool . Do you mind if I recommend myself for the job ?  
 Person2:You ? Do you have a carpenter's license ?  
 Person1:        Yes , of course . But I only freelance on weekends with my uncle .  
 Person2:Wow ! That's cool . So , let me give you some details about the deck I want .  
 Person1:        Please go ahead , I am listening .  
 Person2:I'd like my deck to be at the same level as the back door .  
 Person1:        Is your back door higher than the ground level ?  
 Person2:Yes , the back door is about four or five steps higher than the ground .  
 Person1:        Okay , then you need a deck with a guardrail .  
 Person2:I don't like things to be fancy .  
 Person1:        Don't worry . I will build your deck with a simple but classic look .  
 Person2:Hmm , that's good . Can you use cedar or redwood to build it ?  
 Person1:        Cedar is a good choice .  
 Person2:Well , let's take the measurements right now . 

informal