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:       Are you being served , sir ?  
 Person2:I'd like to buy a tapestry to decorate my new room .  
 Person1:        Artistic tapestry is the highest expression form of the rug weaving art . How about these ones ?  
 Person2:These are beautiful ! Is this the marvelous landscape in Guiling ?  
 Person1:        Yes , sir .  
 Person2:How fine the needlework is ! What's the price ?  
 Person1:        Ninety dollars .  
 Person2:It's too expensive .  
 Person1:        But considering the fine craftsmanship it is worth much more .  
 Person2:You're right . Would you please show me some embroidery ? I also want to buy some embroidered tablecloths to match the tapestry .  
 Person1:        Please wait a minute , sir . 

informal