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:       OK , Mr . Wu . You may come in . I'm Anne Smith and on my right , my colleague , Anna Duncan , and on my left , Angela Lamb . Do please sit down . 
 Person2:Thank you . Good afternoon Mrs . Smith , Miss Duncan , Miss Lamb . 
 Person1:        Your English is fluent . 
 Person2:Thank you . 
 Person1:        How do you think of the weather today ? 
 Person2:I don't like the weather like this . Cold and rainy . Hope it become sunny as soon as possible . 

informal