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:       Excuse me , sir .  
 Person2:What's the matter ?  
 Person1:        I heard that we will call at some ports on the way . Is that true ?  
 Person2:Yes .  
 Person1:        Where will we call at ?  
 Person2:Dalian .  
 Person1:        Dalian is my hometown .  
 Person2:Really ?  
 Person1:        Can I get off the ship and walk around ?  
 Person2:Sorry . I'm afraid you couldn't . 

informal