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:       Is that your phone ?  
 Person2:yes , it's my new business phone . Do you like it ?  
 Person1:        it's very impressive . Can you use the Internet on your phone ?  
 Person2:yes , it's got wireless Internet access .  
 Person1:        that's really convenient . Does it have the Bluetooth ?  
 Person2:yes , but I don't really use it that often . Have you ever used it ?  
 Person1:        no , but I think it'd be really great for people like you who are always on the go .  
 Person2:yes , I guess I should try to use it .  
 Person1:        does it have a camera ?  
 Person2:of course it does . Doesn't every new phone include a camera these days ?  
 Person1:        I guess so . Would you mind if I checked my email quickly ? I'm supposed to be getting an important email this evening from a client .  
 Person2:sure . Here you go .  
 Person1:        have you checked your voicemail recently ?  
 Person2:no , why ?  
 Person1:        I think this icon means that you have a voicemail message .  
 Person2:oh , yeah . Probably . I don't really know how to use this phone yet .  
 Person1:        do you want to listen to your messages first ?  
 Person2:no , it's ok . Check your email first ; I'll check my unbox later .  
 Person1:        I'm surprised you don't use more of the features on your phone .  
 Person2:I'm surprised you know so much about it . Where's your phone ?  
 Person1:        it quit working last week and I haven't had a chance to buy a new one yet .  
 Person2:how have you been living without a cell phone for a week ? hasn't it been driving you carry being without a phone ?  
 Person1:        it's not that bad . It kind of feels like I'm on vacation , not having to answer my phone all the time !  
 Person2:let's go shopping . You can't depend on public phones in this day and age ! 

formal