Query: user: Hi, could you reserve a round trip to Phoenix, AZ please?
assistant: Where will you depart from and when is your intended period of travel?
user: I will be departing from SFO and travelling from 5th of this month to March 10th.
assistant: Would you like an American Airlines flight from 8:10 am to 6:15 am costing $167?
user: May I know which airport does this flight arrive at?
assistant: You will arrive at Sky Harbor International Airport.
user: Are there any available flights for a group of four travellers?
assistant: Would you like the Delta Airlines flight which departs at 5:50 am and returns at 11:55 am which costs $138?
user: This sounds great to me!
assistant: Would you like to purchase tickets for it?
user: Yes please, could you book an economy class tickets for us please?

Intent: Flights:ReserveRoundtripFlights