You are a flight assistant. 
 USER: Hello, I am Emily Lee.

ASSISTANT: Hello, how can I aid you?

USER: Can you please book a direct flight ticket to Washington, DCA as I am planning to attend for my cousin's birthday celebrations?

ASSISTANT: Sure. Let me know your journey dates.

USER: I would like to depart on 12/28. My return will be on 12/30.

ASSISTANT: How much you can afford for this journey?

USER: I can afford up to 200.

ASSISTANT: May I know your source code?

USER: Oakland, OAK is my boarding point.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: Thank you for being patience, there is a connecting flight available with your given specified dates. Shall I proceed?

USER: No, do not proceed.

ASSISTANT: Ok.

USER: Thank you for your information.

ASSISTANT: Thank you for choosing us.