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:       What a hot day !  
 Person2:Yes , summer is coming .  
 Person1:        Where are you going this summer vacation ?  
 Person2:I'd like to go to Tianjin .  
 Person1:        Do you want to go to the beach there ?  
 Person2:Yes , of course . And what's your plan ?  
 Person1:        The same to you .  
 Person2:That's great . 

informal