You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Could you please help me in booking a flight ticket from PHX to IAD?

ASSISTANT: Sure, I'm happy to help you with that. May I know your planned travel dates please?

USER: My travel dates are Nov 10 and Nov 12.

ASSISTANT: Do you prefer stopover in between your journey?

USER: I need a direct flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: I don't have any other specifications.

ASSISTANT: May I know your good name please?

USER: My name is David Parker.

ASSISTANT: Sorry to say, there are no direct flights available for you on those dates.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us, have a nice day.