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:       Waiter , show me the menu , please .  
 Person2:Yes , here you are . Would you care to order now , Sir ?  
 Person1:        I'll have the baked salmon .  
 Person2:Any vegetable ?  
 Person1:        I'd rather have broccoli .  
 Person2:OK . Can I serve you anything else ?  
 Person1:        Yes , I'd like another cup of coffee .  
 Person2:All right . 

formal