How many people are talking in this conversation?

Husband: Waiter!
Waiter: Yes, Sir.
Husband: I’d like to speak to the manager please. .. immediately if possible.
Waiter: I’ll see if he’s available.
Husband: It’s absolutely incredible. It’s the last time I come here, I can tell you.
Wife: All right dear. Calm down!
Manager: Good evening, Sir, Madam. Is anything wrong?
Husband: I’m afraid there is. The service here has been terrible. We had to wait forty minutes for the soup and then it was stone cold.
Manager: I see. Well, I’m sorry to hear that. The trouble is we’re a bit short-staffed at pre-sent. Urn, mainly through illness.
Husband: All right, but that’s no excuse. My wife asked for chicken and she was brought fish instead. It’s just incredible!
Wife: Yes, and my beans weren’t cooked properly, and my husband’s steak was completely burnt underneath! It wasn’t a very enjoyable meat at all.
Manager: Hmm. This is most regrettable.
Husband: Look at this bill. We’ve been overcharged. We only had one dessert, not two. Can you check the bill again, please.
Manager: I do apologize, sir.
Husband: And I’m afraid I’m not going to pay the service charge as I don’t feel satisfied with it.
Manager: I’ll pass on your complaints to the people concerned, and check your bill right away, Sir.
Husband: Thank you.