You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Brian Lopez here. I need to book a ticket from DCA to ORD, can you help me in doing that?

ASSISTANT: Sure, I am ready to help you. May I know on what dates you are willing to travel?

USER: My trip dates are 10/11 to 10/13.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Sorry, there are no flights found on your travel dates.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.