The second question sounds less sure. The speaker uses rising intonation and a tag question with a negative tag.
The first question has two positive tags, which is a special case asking for information.
Tapescript 2
Receptionist: Yeah.
Jean Douglas: I wrote to you last month about accommodation and you replied with some information.
Receptionist: Uh, huh. And how can I help you now?
Jean Douglas: You still have a double room and a single room available from 20th February till 6th March, do you?
Receptionist: Just a moment … let me see … yes, we do.
Jean Douglas: And they have a view over the harbor, don’t they?