You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you help me to book a flight ticket from PHX to IAD?

ASSISTANT: Please provide your trip dates.

USER: My travel dates are Apr 21 and Apr 23.

ASSISTANT: Do you have any connecting flight preferences?

USER: I prefer connecting flight on this route.

ASSISTANT: Is there any other concern?

USER: No, thanks for asking.

ASSISTANT: May I know your name please?

USER: I am Stephen Lee. Sorry I would like to prefer normal cost airline.

ASSISTANT: Sure, please give me a while.

USER: Sure.

ASSISTANT: Hawaiian Airlines is providing the connecting flight on this route and the fare of 100. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your reservation is confirmed for the flight 1003.

USER: Thank you.

ASSISTANT: Thank you for choosing us.