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 , do you know the shortcut to the Lincoln park ?  
 Person2:Well , there does have one . Walk along the road and turn left when you come to a bystreet . It will lead you to the back gate of the park .  
 Person1:        Thank you very much . Is the back gate open now ?  
 Person2:I don't think so . 

formal