You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you aid me to book a ticket from DCA to LAX?

ASSISTANT: Ok, please can I know your name to proceed further?

USER: David Brown here.

ASSISTANT: Ok, please can I know the dates of your journey?

USER: My trip dates are Aug 15 and Aug 17 respectively.

ASSISTANT: Do you have any preferred connection limit?

USER: Make sure that I am looking for a direct flight to travel.

ASSISTANT: Sorry, there are no flights available at your preferred locations.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing our agency.