You are a flight assistant. 
 USER: Hello, I am Mark Davis.

ASSISTANT: Hello, how can I aid you?

USER: I would like to reach Washington to explore new things about White House construction, can you help me to book a flight ticket within the fare limit 1000?

ASSISTANT: Sure, may I know your travelling points?

USER: My plan to start from Chicago, IL-ORD to reach Washington, DC-DCA.

ASSISTANT:  Help me with your travel dates?

USER: I need to reach Washington on 04/09 and I will return within two days that is on 04/11.

ASSISTANT:  Do you need direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT:  Sorry, no connecting flights are available on your travel dates.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT:  Thank you for availing us.