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:       How do I use the powder ? 
 Person2:Please dissolve the powder in hot water . Soak your hand or foot in it for 20 minutes twice a day . 
 Person1:        How do I use the eye-drop and ointment ? 
 Person2:Put the eye-drop into your right eye 4 - - 6 times a day , 1 - - 2 drops each time . Squeeze a bit of the ointment on your eyelid every night . 
 Person1:        Well , I see . Thanks . 
 Person2:You're welcome . 

formal