You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Jonathan Brown here. I would like to prefer a normal-cost airline for my business trip to Phoenix. So can you book the flight ticket for me?

ASSISTANT: Sure, can I know your travelling dates?

USER: The trip dates are from Mar 29 to Mar 31.

ASSISTANT: May I know your airport codes?

USER: The airport codes are from JFK to PHX.

ASSISTANT: Do you prefer a connecting flight?

USER: I prefer a direct flight.

ASSISTANT: Do you have any other preferences?

USER: The depart time would be after noon.

ASSISTANT: Sorry, there are no flights available on your request.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us.