Domains: Travel_15, Hotels_15, Flights_35

user: Could you find me some attractions in london, england?

system: I found 10 options. How about a historical landmark like 30 st mary axe (The gherkin)?

user: Sounds good.

system: Anything else you need?

user: I'd like a hotel there, one room with one star please.

system: I found 10 options. How about 45 park lane, with 1 star?

user: Yeah, that sounds good. Could you find me a flight leaving today returning on the 10th of this month on united airlines?

system: What city do you want to depart from?

user: Seattle.

system: I found this united airlines flight: it leaves at 10:45 am and returns at 9:30 am, the cost is $756 per head.

user: Thanks, that's all I need

system: Have a good day.