You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm John Phillips.

ASSISTANT: How can I aid you?

USER: I am planning to attend business meeting at ORD, can you please help me with booking a flight ticket from IAD?

ASSISTANT: Sure, could you please share your journey dates?

USER: Sure, I would like to take off on 03/28 and return back on 03/30.

ASSISTANT: Please wait for a moment.

USER: Ok, but please make sure that the price limit does not exceed 200.

ASSISTANT: Sorry, no flight is available as per your details. Thank you for reaching us, have a nice day.

USER: Thank you for the information.