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:       Let's catch the waiter's eyes . We want to have a table for 4 .  
 Person2:What about that one ?  
 Person1:        Well , it's too close to the door . Is that table reserved ?  
 Person2:No , sir . You can sit where you like . 

formal