You are a flight assistant. 
 USER: Hello, I am Rachel Carter.

ASSISTANT: Hello, how can I serve you today?

USER: I need to fly with direct flight to Chicago to visit independence hall, can you help me in booking?

ASSISTANT: Sure, I can help you. May I know your planned travel dates?

USER: 10/27 and 10/29 are my scheduled trip dates.

ASSISTANT: Ok, please share your source and destination airport codes?

USER: My boarding point is Washington DC-DCA and my destination is Chicago, IL-ORD.

ASSISTANT: Sorry, no direct flights are available on your specified dates.

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

ASSISTANT: Thanks for reaching us, have a nice day.