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:       When you are in a restaurant you want the waiter to bring the bill , what do you do to attract his attention ?  
 Person2:I just make eye contact with him and nod my head . Then I tell him when he comes over to the table . Why do you ask ?  
 Person1:        I went out with my girlfriend to a nice restaurant last night and I noticed that many people shouted for the bill .  
 Person2:That seems a little impolite in such a restaurant .  
 Person1:        That ’ s what I thought . I just thought I ’ d ask you and see what you thought of it . Anyway , what did you do yesterday evening ?  
 Person2:Well , it was a warm evening , so I stretched my legs . I walked along the canal for a couple of miles . Actually , several other people had the same idea . I saw Bill .  
 Person1:        Did you ? How is he these days ?  
 Person2:He seemed ok . We didn ’ t stop and chat because we were on opposite banks of the canal . We just waved at each other .  
 Person1:        I need to move some furniture . Could you help me to lift it ?  
 Person2:Of course . What do you want to move first ?  
 Person1:        Let ’ s move the sofa . Can you get a grip on the bottom at that end ? I ’ ll lift this end . I want to move it sideways in that direction . 

informal