You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am planning to book a flight ticket to IAD from LAX, can you please help me out?

ASSISTANT: How may I assist you? Sure, we are here to help you. Can you share me your trip dates?

USER: Sure, my planned travelling dates are Sept 20 and Sept 22.

ASSISTANT: Do you need any break in your journey?

USER: Yes, I am looking for a direct flight.

ASSISTANT: Is there any airline preference for you?

USER: No.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Larry Edwards.

ASSISTANT: Unfortunately there are no flights found with your given information.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for opting us.