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:       Hello , Ann ! Is that you ?  
 Person2:Yes , it is . Hi , Tom ! It's a real surprise to see you here .  
 Person1:        It's been a long time ! What's new ?  
 Person2:Nothing much . What about you ? Is everything going well ?  
 Person1:        Not bad I guess . I just got back from Hawaii .  
 Person2:How was it ?  
 Person1:        I had a good time . You seem to be in a hurry . Don't let me hold you up .  
 Person2:Sorry , I've got a meeting in half an hour .  
 Person1:        Ok , I won't keep you then .  
 Person2:Great ! It's good to see you . Goodbye !  
 Person1:        Yes , stay in touch . Bye !  
 Person2:Give me your email , would you ?  
 Person1:        Sure ! It's txyb@gmail.com . 

informal