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:       Good afternoon , madam . May I help you ?  
 Person2:Do you have some new perfume ?  
 Person1:        I am sorry , madam . I didn't hear you . It's too noisy here . Could you please say it again ?  
 Person2:Well , I wanna buy some new perfume .  
 Person1:        Would you please wait a minute ? I will get one for you at once .  
 Person2:That's all right .  
 Person1:        Here you are .  
 Person2:Can I open it ?  
 Person1:        Yes , certainly , madam .  
 Person2:It smells sweet .  
 Person1:        Yes , it is . This perfume just arrived yesterday , and it's the latest products of Chanel .  
 Person2:Really ? How much is it ?  
 Person1:        55 dollars , madam .  
 Person2:Ok , I will take two bottles .  
 Person1:        Thank you . Do you need something else ?  
 Person2:No , thanks . 

informal