You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I would like to attend live music concert at Philadelphia, can you please reserve flight ticket from DCA to PHL?

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

USER: Sure, my planned travelling dates are Sep, 21 and 23 respectively.

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

USER: Yes, I would like to depart at afternoon in my journey.

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

USER: Flight has to be with single connection.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class to travel.

ASSISTANT: May I know your good name please?

USER: Patrick Hall here.

ASSISTANT: We found American airline with economy class and flight number is 1015 with arrival time is 6.00 hours and departure time is 17.00 hours.Shall I proceed for booking?

USER: Please proceed for booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your service.

ASSISTANT: You are welcome.