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 are you looking for ?  
 Person2:I lost one of my contact lenses , and I ’ m searching high and low for it .  
 Person1:        Where did you lose it ? Maybe I can help you to find it .  
 Person2:Thank you very much . I think I lost it near the window . 

informal