You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Sarah Edwards want to book a ticket to attend a arts festival at Washington, can you please help me in booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to travel on 03/22 and return on 03/24.

ASSISTANT: May I know your source and destination points?

USER: My source and destination codes are OAK-DCA.

ASSISTANT: Do you need a halt in between your journey?

USER: I need a direct flight.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.