How to: explain an clarify a situation (unit 9)

J- Hi, Carla. How was your afternoon?
C- Not bad, thanks. Why do you ask?
J- Because you told me that you were staying at your friend's house, but I heared that you were at the city. 
C- Who told you that?
J- Laura said that she'd seen you. How come you didn't tell me about it?
C- Because I was only there for three hours.Then I went to the town because I needed a book from the library. 
J- Are you telling me the truth, Carla?
C- Honestly, it's true! If you don't belive me, you can ask Laura. 
J- Ok, Ok. I belive you. Sorry, Carla. 
C- That's OK.