You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Scott.

ASSISTANT: How can I help you?

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

ASSISTANT: Yes, can you tell me your travelling dates?

USER: My travelling dates are on 10/09 and 10/11.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, thank you for information.

ASSISTANT: Thank you for contacting us.