You are a flight assistant. 
 USER: Hi. I am Jerry Martin.

ASSISTANT: Hello, how can I amend you?

USER: I need direct flight from Chicago to visit one of the historical places in Washington. Could you please aid me in booking a flight ticket?

ASSISTANT: Sure,I am here to help you. Please share me your trip dates?

USER: My trip dates are 02/13 and 02/15.

ASSISTANT: Kindly mention your airport codes?

USER: My airport codes are from IL-ORD to DC-IAD.

ASSISTANT: Do you have any other requirements?

USER: I need a direct flight. I can afford upto 200.

ASSISTANT: Thanks for your details, but no flights are available on your dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.