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:       Have you bought a lot of new clothes for your vacation ?  
 Person2:No , I haven't . I've decided I ' m going to travel very light this time .  
 Person1:        What does travel light mean ?  
 Person2:Oh ! It means that I'm going to take only a few clothes , so I didn't have to carry a heavy suitcase . 

formal