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'.
--------
Question: Person1: What happened to you yesterday ?
Person2:Oh I fell over on the way to work .
Person1: Oh I see . So that ' s why you didn ' t come in ?
Person2:Yes and I broke my phone too so I couldn ' t call you .
Person1: Oh dear , that sounds terrible .
Person2:It was ! But the worst thing was I tore my best shirt .
Person1: Oh dear . Well , get well soon and try to be more careful in future .

Answer: informal

Question: Person1: What color is your new dress ?
Person2:It is green . Come upstairs and see it .
Person1: Thanks you .
Person2:Look ! Here it is !
Person1: That ' s a nice dress . It ' s very smart .
Person2:My hat ' s new , too .
Person1: What color is it ?
Person2:It ' s the same color . It ' s green , too .
Person1: That ' s a lovely hat .

Answer: informal

Question: Person1: Mr . Smith , welcome to our factory .
Person2:I've been looking forward to visiting your factory .
Person1: You'll know our products better after this visit .

Answer:
informal