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:       Hello sir , may I help you ?  
 Person2:Yeah , I accidentally dropped my phone in the toilet .  
 Person1:        I see . Well , you have come to the right place . We have over one hundred models of more than twenty leading mobile phone manufacturers .  
 Person2:Sounds good . I don ’ t want it to be too expensive , maybe something mid-range .  
 Person1:        We have this new ETC smart phone.It comes with the Android OS so you can download applications . It also has a built-in camera , mp3 player and touch screen . It works on the 3G network so you have fast access to the internet wherever you are .  
 Person2:What about Wi-fi ?  
 Person1:        Of course ! You can access the internet from any hotspot as well as from home .  
 Person2:One last thing . Is it waterproof ? 

informal