You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Margaret Rodriguez. Can you please book a flight ticket from DCA to ORD?

ASSISTANT: Margaret, I am happy to help you. Please let me know your trip dates.

USER: Sure, I need to travel on dates of 11/11 and 11/13.

ASSISTANT: Ok, please wait. I will check for the available flights and let you know.

USER: Sure but please make sure that connection 0.

ASSISTANT: Margaret, there is no direct flight available on your preferred travel dates.

USER: Oh! It is sad to hear. I need to choose another agency this time to reach there. Anyway, thank you for your time.

ASSISTANT: You are welcome and thank you for choosing us.