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 go swimming . 
 Person2:But , we just finished eating lunch . 
 Person1:        I know , but I'm really hot . 
 Person2:I'd strongly recommend that you wait for a while before going swimming . 

informal