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'.

Example Input: Person1: You seem to be very hesitant about doing things .
Person2:I don't know why I cannot take a step forward .
Person1: You are meeting trouble halfway , I guess .
Person2:Many things are troubling me . I don't know whether I should come and go .
Person1: That's where the shoe pinches .
Example Output: informal

Example Input: Person1: Do you like traveling ?
Person2:Yes . I ' Ve just come back from Scotland .
Person1: Where did you visit ?
Person2:I only had time to visit Edinburgh .
Person1: How did you like it ?
Person2:It ' s fantastic .
Person1: Where did you go there .
Person2:I went to there on business .
Person1: And do you have friend there ?
Person2:Yes , a lot of friends .
Person1: You must enjoy yourself .
Person2:Yes . And I took many pictures .
Example Output: formal

Example Input: Person1: Welcome to our shop . It seems you are interested in this dress .
Person2:Yes . But I am afraid it is too thick to wear in summer .
Person1: That's no problem . It is made of linen , so you won't feel hot in it . I can assure you it is of superior quality . What is more , it is very popular with young women .
Person2:How much is it ?
Person1: 88 Yuan .
Person2:OK , that is reasonable . I will take it .
Example Output:
formal