You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of help are you seeking for?

USER: I am looking for a direct flight for my journey from DCA to LAX, can you please help me to book my flight ticket?

ASSISTANT: Ok, may I know your desirable dates please?

USER: Yes, I will depart on 5th Dec and return back on 7th Dec.

ASSISTANT: Do you prefer any halt between your journey?

USER: Yes, I need connecting flight.

ASSISTANT: Meanwhile, may I know your good name please?

USER: My name is Cynthia Miller.

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

USER: Can you please check for the direct flight?

ASSISTANT: I checked for a direct flight only. But could not find any availability for you.

USER: Ok. Anyway, thank you for checking.

ASSISTANT: Thank you for approaching our services.