You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you for the day?

USER: Please help me out in booking the ticket from ORD to DCA.

ASSISTANT: When you are willing to travel?

USER: My trip dates will be Nov 13 to Nov 15.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: May, I know your good name?

USER: Donna Lopez is my name.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.