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:       what are you looking for ? 
 Person2:I want to buy a new camcorder for my trip this summer . 
 Person1:        do you know what camcorder options are available ? 
 Person2:not really . I thought I'd just have a look today . 
 Person1:        would you like to look at the new digital camcorders that have just come in ? 
 Person2:sure . I'd like to see the smallest camcorder that you have first . 
 Person1:        ok . This Sony model is their newest and our most popular camcorder . Why don't you see if you like the way it feel ? 
 Person2:it's very light . That would be good . How is the battery life ? 
 Person1:        it's got an above-average battery life . It lasts up tp 12 hours and can be charged in 30 minutes . 
 Person2:can you also take still photos with this ? 
 Person1:        yes , that is an option . 
 Person2:how about night vision ? Can you use it in the dark ? 
 Person1:        yes . I can show you examples of some footages that was taken with this camera in the dark . 
 Person2:that's not bad at all . How's the microphone ? Does it pick up much sound ? 
 Person1:        It can record any sound that's within about 8 feet of the camera . 
 Person2:how does that compare with other models ? 
 Person1:        there are models that can pick up more sound than this one , but they're much bigger and heavier than this one . 
 Person2:I guess you can't have everything , can you ? 

formal