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:       Hi , could you help me find a place where I could buy some lunch ?  
 Person2:Sure ! What kind of food would you like ?  
 Person1:        I was thinking of pizza or something else Italian , maybe .  
 Person2:I know the perfect place !  
 Person1:        Good ! Where is it ?  
 Person2:It's right past that last building on the left . Do you want me to go with you ?  
 Person1:        That would be great .  
 Person2:Glad you asked me to join you . This will be fun ! 

informal