I have often noticed people who make statements, actually ending with a question mark when written, but where there is no actual question asked.
The question is implied sufficiently enough in the context of the statement, and/or the previous statement that the question portion can be omitted. Some examples:
Sandra: I'm not walking to the theatre as I didn't bring a jacket.
Julie: I have a spare jacket?
In the above, it is clear that Julie is asking "would you like to borrow my spare jacket so that we can walk to the theatre".
Paul: We aren't going to Pizza Hut at lunch as it's too far to walk in an hour.
Dave: I have my car today?
Again, it is clear that Dave is offering to drive and asking if that is an option.
Is there a term to describe this?