You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: Yes, I need our help in ticket booking from DCA to ORD.

ASSISTANT: Sure, may I know your trip dates?

USER: My travelling dates are fro 08/25 to 08/27.

ASSISTANT: Ok, could I have your name please?

USER: I am Sharon King.

ASSISTANT: Sorry, there is no plane as per your requested travelling dates.

USER: It's ok. Thank you.