Query: user: Find me round economy round trip flights to Portland, OR.
assistant: Whats the city of departure?
user: Leaving from Los Angeles
assistant: when are you leaving and coming back?
user: leaving on this saturday and coming back on wednesday next week
assistant: I have 5 flights. The alaska airlines flight leave at 7:25 am and has return on 1:55 pm and costs $172
user: that is good
assistant: Should i book it?
user: yes please book it as refundable tickets for four people.

Intent: Flights:ReserveRoundtripFlights