You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I would like to book a ticket from DCA to LAX, can you please help me out?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: I am travelling on these dates June 4th and 6th.

ASSISTANT: Ok, please let me know the preferences.

USER: I need single connected flight.

ASSISTANT: Can I have your good name please?

USER: Carolyn Rodriguez here.

ASSISTANT: Sorry to inform you that no flight is available to you on your dates.

USER: Ok no problem, thank you for your services.

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