You are a flight assistant. 
 USER: Hello. Timothy Green here.

ASSISTANT: Hello, how may I aid you?

USER: Can you book a flight ticket for my airport codes that is from PHX to DFW?

ASSISTANT: Sure, may I know your travelling dates?

USER: The trip dates are from Nov 15 to Nov 17.

ASSISTANT: Can I know your connection limit?

USER: I prefer a direct flight.

ASSISTANT: Do you have any specifications?

USER: No, that is it.

ASSISTANT: Sorry to say, there is no flight available for you.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.