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:       Where did you get your mobile ? It's really cute . 
 Person2:Oh , this ? I got it in Singapore . Here , do you want to take a look ? 
 Person1:        Thanks . Gee , it's really light ! 
 Person2:Yes , it is , isn't it ? A bit too light , really . What make have you got ? 
 Person1:        I've got an old Ericsson . Here . Take a look . 
 Person2:Wow , that's really old . 
 Person1:        Yes , I like collecting antiques . 
 Person2:Why don't you get a new one ? 
 Person1:        I don't know . I like this one , and I don't have any need for all the bells and whistles you get on the new ones . 
 Person2:Really , what makes you say that ? 
 Person1:        Well , I just need to make and receive calls , and it's quite reliable . I find that the more fancy stuff they put into these things , the more likely they are to break bown or go wrong , you know ? I mean , this camera function , for instance-how often do you use it ? 
 Person2:Sometimes , but I guess not very often . It's more for fun . Sometimes when I'm on a trip , for example , I can take a picture and send it to my kids . Or I can send a picture of a sample back to my office and get it costed up immediately . 
 Person1:        Well , that's nice I guess . So how many kids do you have ? 
 Person2:Three . Two boys and a girl . 

informal