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:       So , what do you think ? How do you like New York ? 
 Person2:I'm having a great time . I love it . I'm glad we came . 
 Person1:        Yeah . I really like the stores and the shopping . 
 Person2:I love the museums , too . 
 Person1:        But the traffic is pretty bad . 
 Person2:Yeah . I hate all this traffic . It's really noisy . 
 Person1:        Listen , it's almost dinnertime.There are lots of restaurant around here.What do you want to try ? Italian ? Greek ? Japanese ? Thai ? 
 Person2:I can't stand making decisions . You choose ! 
 Person1:        OK . Let's go American . Where's the nearest McDonald's ? 

informal