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:       Can I help you ?  
 Person2:I'd like to buy a new mobile phone please .  
 Person1:        Ok , would you like a phone with camera and MP3 player ?  
 Person2:Yes please . And I ’ d like to be able to make video calls too . 

formal