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:       Come on , Jenny , we are heading our way to the Opera House .  
 Person2:I am dead tired and I can't walk any further .  
 Person1:        Oh , I am sorry , I thought you were not .  
 Person2:Why don't we stop and have a rest here ?  
 Person1:        Fine . Actually I am a little tired too . Want some water ? 

informal