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:       Good morning . How can I help you ?  
 Person2:I want to apply for a passport here .  
 Person1:        OK . Please fill in these forms and take them back when you are done .  
 Person2:( 10 minutes later . ) Hi . Here are completed forms .  
 Person1:        OK . Can I have your original ID card and tw0 2 - inch photos ?  
 Person2:Here you are , But I forgot my photos .  
 Person1:        That is OK . We have photo taking service here . You may pay your fee , take a photo there and take it back here .  
 Person2:OK . I am going right now . 

formal