You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Christine Rodriguez here.

ASSISTANT: Ok.

USER: I want to attend a Seminar in Chicago. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you with that. Can you please mention your location codes?

USER: My airport codes are DCA and ORD.

ASSISTANT: Ok, when are you willing to travel?

USER: I want to travel on 09/25 and 09/27.

ASSISTANT: Do you need any break in between your journey?

USER: I would prefer single halt.

ASSISTANT: Do you prefer any other specifications?

USER: I would prefer normal cost flight.

ASSISTANT: Ok, please wait for a while. Let me check the availability of the flights.

USER: Ok, I will wait.

ASSISTANT: Sorry, no flight found with your given data.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.