You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be at your service?

USER: Can you aid me to book a flight ticket from PHX to ORD?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are Oct 17 and Oct 19 respectively.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I want a connecting flight.

ASSISTANT: If you can help me with your name, I can check with the availability of flights.

USER: Scott Collins here.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: No other preferences.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Thank you.

ASSISTANT: Thank you for choosing us.