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:       Hey Michael . Where are you going ? 
 Person2:No where special . I was just taking a walk . 
 Person1:        What for ? 
 Person2:To get a little exercise . I'm so out of shape . 
 Person1:        Hey , I play basketball with a bunch of friends twice a week . It's great exercise and it's fun too . Why don't you come out and play with us ? 
 Person2:That sounds great . Give me a call next time you guys play . 

informal