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 Colin . How are you feeling today ?  
 Person2:Oh , I feel ok but I ’ m still very tired .  
 Person1:        It's probably jet lag .  
 Person2:I think so . One minute I feel quite awake , and the next I feel very tired .  
 Person1:        Do you want to visit any tourist spots in the city ?  
 Person2:Oh yes , I'm very interested in Chinese history so I ’ d like to visit the Summer Palace .  
 Person1:        Good idea . I ’ d be very happy to go there . 

informal