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 want to say goodbye to everyone .  
 Person2:You ’ re leaving so soon . When are you off ?  
 Person1:        I ’ m catching the nine fifteen train tomorrow morning .  
 Person2:how about I come and see you off ?  
 Person1:        You really don ’ t need to .  
 Person2:Ok . I ’ ll miss you . I hope we can see each other again soon .  
 Person1:        I hope so , too . Thank you , Lily . Thank you for everything .  
 Person2:You ’ re welcome .  
 Person1:        Please say goodbye to the rest of the family for me .  
 Person2:Ok . Take care . I hope you have a good journey .  
 Person1:        Thank you . Remember to look me up if you ’ re ever in Washington .  
 Person2:Of course . I will .  
 Person1:        Goodbye , then . Thanks again for everything . 

informal