You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Please reserve me a flight ticket from DEN to PHX.

ASSISTANT: May I know your travel dates?

USER: My travel dates are Dec 05 and Dec 07.

ASSISTANT: Do you have any connecting preferences?

USER: I prefer direct flight for this trip.

ASSISTANT: Is there any other concern?

USER: No.

ASSISTANT: May I know your name please?

USER: I am Margaret Harris.

ASSISTANT: Delta Airlines is providing the direct flight on  this route and the fare of 200.

USER: Please proceed to book my flight ticket in this airlines.

ASSISTANT: Your reservation is confirmed for the flight 1013.

USER: Thank you.

ASSISTANT: Thank you for choosing us.