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:       Will we drive to the seaside ?  
 Person2:Yes , it will take about four hours . We can leave about noon and get there by supper time .  
 Person1:        Let me help pay for gas .  
 Person2:All right . There will be three of us going so we will each pay a third .  
 Person1:        What other expenses will we have ?  
 Person2:There won't be many other expenses expect food . 

informal