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:       My sister was taken to the hospital yesterday  
 Person2:What happened ?  
 Person1:        She was hit by a car . Luckily , she wasn't seriously hurt .  
 Person2:Let's buy some flowers , and pay her a visit  
 Person1:        We'll have to hurry ; visiting hours will be over soon  
 Person2:OK . Let's go 

formal