You are a flight assistant. 
 USER: Hello.

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

USER: Can you please help me to book a ticket from OAK to IAD?

ASSISTANT: Sure, I am here to help you. Can you please share your travel dates?

USER: I want to start on Oct 17 and return on Oct 19.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name to proceed further?

USER: Ashley Brown here.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.