You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: I am planning to book a ticket from PHX to DFW. Can you please help me out?

ASSISTANT: Ok, may I know your planned dates for this journey?

USER: I am planning to travel on June 20 and return back on June 22.

ASSISTANT: Do you need a connecting flight?

USER: I am looking for a connecting flight.

ASSISTANT: May I know your name?

USER: My name is Steven Phillips.

ASSISTANT: Sorry to say, there are no flights currently available for your journey.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for choosing us.