You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Edwards Roberts.

ASSISTANT: How can I assist you today?

USER: I would like to book a flight ticket from DCA to attend a robotic workshop at ORD, can you help me to book an economy class ticket?

ASSISTANT: Sure, I can help you in that. May I know your planned travel dates please?

USER: My travelling dates are 12/27 and 12/29.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait for a while.

USER:       Ok.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for choosing us, have a great day.