You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Margaret Walker here.

ASSISTANT: How can I assist you?

USER: I want to participate in Boston marathon, could you book my ticket from Denver?

ASSISTANT: Please can I know your travel dates to book a flight ticket?

USER: My itinerary dates are Oct 13 and Oct 15.

ASSISTANT: Please let me know the airport codes to check for the availability.

USER: My genesis and terminus airport codes are DEN and BOS.

ASSISTANT: Can I know the connection limit you prefer?

USER: I prefer a connecting flight.

ASSISTANT: There is a flight ticket available with 1 connecting flight and airfare is 200. Can I book the flight 1000?

USER: I want to depart in the afternoon.

ASSISTANT: There is a flight in the afternoon and the airlines is UA. Can I book?

USER: Please book my ticket.

ASSISTANT: Ok, the flight ticket is been booked. The return timing is 7:00AM.

USER: Thank you.

ASSISTANT: Thank you for choosing our agency.