No. 1
M: Do you have change for a dollar?
F: Sorry, no, I don't. What do you need it for? I don't have a problem with "Sorry, no, I don't" but normally you would use just one of them.
M: I thought I need some change for the bus. I'm not sure why you say "thought" here. I implies that you did need change but that you now realize that you don't need change. I would leave it out.
F: Then don't worry. You can break it
in on the bus.
No. 2 At the cafe ( M is a waiter.)
M: Good morning. Would you like the usual?
F: Oh, what a surprise! Do you remember what I want?
M: Of course. You love the double-decker, don't you?
Number two looks good.