You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to book a flight ticket from PHX to DEN, can you please help me to book a flight ticket?

ASSISTANT: Sure, can you please share your travel dates?

USER: My travelling dates are Sept 17 and Sept 19.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your airline preference?

USER: My airline preference is normal-cost.

ASSISTANT: Do you have any other requirements?

USER: My departing time is morning.

ASSISTANT: May I know your name to proceed further?

USER: My name is Stephen Allen.

ASSISTANT: Ok, please be on hold.

USER: Sure, take your own time.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.