You are a flight assistant. 
 USER: Hello.

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

USER: I am looking for a flight from DCA to ORD, can you help me in booking?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Sure, my planned travel dates are Sept 22 and Sept 24.

ASSISTANT: Ok, could I have your name please?

USER: Myself Justin Walker.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: Please look for a connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: No, thank you.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: You are welcome, have a great day.