You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is Katherine Brown. I want to travel from Oakland, CA- OAK to Washington DC- IAD.

ASSISTANT: Can I know your travelling dates?

USER: My preferable travelling dates are from 01/10 to 01/12.

ASSISTANT: Do you have any other restrictions about price and connection limit?

USER: I need my ticket price within 1000 and connections limit as one.

ASSISTANT: Sorry to say this Katherine Brown there are no flight available on your travel dates. Thank you for reaching us.