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 dressing would you like on the salad ? 
 Person2:French dressing , please . 
 Person1:        I beg your pardon ? 
 Person2:Oh , French dressing . 
 Person1:        Sorry , it's not available now . Anything else ? 
 Person2:We still prefer French dressing . 
 Person1:        Will you say it again ? 
 Person2:Who's your manager ? Tell me ! Would you ? 

formal