You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Could you book my ticket in a direct flight?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My itinerary dates are Feb 18 and Feb 20.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I already mentioned.

ASSISTANT: Can you please share your airport codes?

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

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I am comfortable to travel at any time.

ASSISTANT: We found American airline with economy class and flight number is 1028 with arrival time is 21:00 hours and departure time is 23:00 hours.Shall I proceed for booking?

USER: Please proceed.

ASSISTANT: May I know your good name please?

USER: Debra Edwards here.

ASSISTANT: Your ticket is booked.

USER: Thank you for assisting me.

ASSISTANT: You are welcome.