What is the relationship between the two speakers?

A: Hello. I’d like some information about your trips to Canada.
B: Yes, of course. What can I tell you?
A: Well, how do we travel there?
B: It’s a special adapted bus with room for sleeping.
A: And how many people in a group?
B: Well, the bus sleeps ten. Usually there are eight travelers and two drivers and one guide to look after you.
A: So we sleep normally in the bus?
B: Yes, and it’s fully equipped for cooking and it’s got a shower system that we put up every evening, weather permitting.
A: Er, we leave from London.
B: Yes, and return to London.
A: Is there anything special we’d have to bring?
B: Oh, we give everyone a list of suitable clothes, etc. to bring. Of course, space is limited.
A: Oh, yes, I understand that. Now, how long in advance would I have to book?
B: Well, it depends. Usually six or eight months. It’s amazing the number of people who are interested.
A: Well, I’m interested in the ten-week trip next spring.
B: That one leaves on the fourth of April.
A: That’s right. It’ll be for two people.
B: That’d be fine. You could come in and we can go over all the details.
A: Yes, I’d think that’d be the best, but can you give me some idea of how much that’ll cost.
B: Spring for ten weeks. We haven’t got the exact figures at the moment, but something like, er, 1,100 pounds per person.
A: OK. I’ll come and see you one day next week.
B: Yes. Thanks for ringing.
A: Thank you. Bye.
B: Bye.