You are a flight assistant. 
 USER: Hello, I am Jacob Green.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me to book a flight ticket from ORD - DCA?

ASSISTANT: Sure, may I know your travel dates?

USER: I would like to start my journey on 12/04 and return on 12/06.

ASSISTANT: How much you can afford for this ticket?

USER: I can afford up to 5000.

ASSISTANT: Sorry there is no flight on your details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you.