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 a nice garden ! Look at these tulips !  
 Person2:that would be a good shot . Can you take my picture here , dear ? Please try to get the garden in the frame as well .  
 Person1:        all right . Would you please stand closer to the flower bed ? Good . Smile . Say " cheese " . OK , got you . That's terrific .  
 Person2:thanks . Could you take one more from this angle ?  
 Person1:        no problem .  
 Person2:now let's have one together .  
 Person1:        do you know how to set the timer ?  
 Person2:let me see ... set the timer first and push the button , oh , come here .  
 Person1:        OK , let's have a try .  
 Person2:cheese ...  
 Person1:        did it come out ?  
 Person2:yes , but it's blurred and a little dark .  
 Person1:        never mind . Let's go to the falls and try again .  
 Person2:Ok , let's go . 

informal