Although they may not seem quite right, they are sentences in the present simple tense. There are two contexts in which this might occur. One is an account of a 'ritual' exchange between two people, Karen and Marianne. The present simple is used to denote habitual or regular actions, and this exchange may be such - every time Karen sees Marianne she asks her 'Are you alright?', and Marianne always replies 'I'm fine'.
The other context is quite different. Books for young children are often written in the present simple. However, this exchange is not the style that you would normally expect to see in this type of book. I would go for the first possibility [above].
Edited to take account of John's suggestion [below], which is probably the best one. The present simple is often used for 'dramatic effect' even when describing events in the past.