How many people does Veto Muller book rooms for?

Vera Muller: Good morning. My name’s Vera Muller. I’d like to book some accommodation for tomorrow for five nights, from April 1st to 5th.
R: Just one moment, madam. We are rather full at the moment because of the trade fair. What kind of rooms would you like?
V: Three single rooms, all one the same floor.
R: I have three double rooms but not three singles available, sorry.
V: What’s the difference in price?
R: Single rooms are 400 francs, doubles are 700 francs.
V: I see. What kind of rooms are the double rooms?
R: Very nice rooms, madam. I can give you three doubles on the sixth floor overlooking the city. They have balconies and bathrooms.
V: One of the guests is in a wheelchair. Are these rooms accessible by wheelchair?
R: No, madam. The lift goes to the 5th floor only. In that case you could have three rooms on the ground floor one single and two doubles. No view of the city, but close to the garden.
V: Do you have a small conference room I can reserve for April 3rd all day?
R: Yes, we have a nice quiet room that will take about 12 people, would that be suitable?
V: That would be fine. And are the public rooms all accessible without having to go up or down steps?
R: Yes, madam. The restaurant is on the first floor—there’s a lift. Otherwise everything including the conference room is on the ground floor,
V: All right, fine. Then I’d like to book the three rooms on the ground floor fur Acme International. The guests’ names are Mr. H. Meier, Miss. A. Schwarz and Mr. D. Negri.
R: Thank you, so that’s three rooms on the ground floor arriving on April 1st and departing on April 6th. And the conference room all day on April 3rd.
V: Right.
R: Ok. Can I have your telephone number please?
V: Yes, It’s 41223489. I’ll confirm this by telex.
R: Fine, thank you Ms Muller. Goodbye.
V: Bye.