Here are the statements changed into reported speech:

1. My uncle asked me if a return ticket was cheaper than two singles.
2. A dog owner asked if puppies traveled free.
3. She asked me if she could bring her dog into the plane with her.
4. Bill asked if that train stopped at York.
5. A businessman asked if you could telephone from inter-city trains.
6. He enquired if the 2.40 train had a business room.
7. My aunt asked if you could get coffee on the train.
8. She said if they brought it round on a trolley.
9. The man with the pipe asked if there were smoking compartments.
10. I asked him if you booked a seat.
11. Bob asked if he could sit there.
12. Bill asked if I wanted to buy any second-hand books.
13. Janet asked if Tom may leave late that day.
14. Brown asked me if I played rugby.
15. He asked me if I would have time to play regularly.