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:       I hear you are moving to Dalian .  
 Person2:Yes . I found a very good job down here .  
 Person1:        Well , we'll certainly miss you here .  
 Person2:I am going to miss you , too .  
 Person1:        Let's keep in touch .  
 Person2:OK . I will write to you as soon as I get there . 

informal