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:       Hi , John ! How was your vacation ? 
 Person2:We went to Malaysia and Thailand . 
 Person1:        That must have been wonderful . Do anything interesting ? 
 Person2:Well . We went bungee jumping when we were in Malaysia . 
 Person1:        Wow , isn't that dangerous ? 
 Person2:A little , but the rush was worth it . 
 Person1:        Tell me about it . 
 Person2:We jumped off a bridge and fell 500 feet before the bungee cord caught us . 
 Person1:        500 feet ! I would never be able to do that . 
 Person2:Yeah , It was scary but exhilarating . 

informal