You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Raymond Walker. I would like to spend my holidays at Washington, can you please help me to book a flight ticket from ORD to IAD?

ASSISTANT: Sure, let me know your travelling dates.

USER: Sure, my trip dates are from 12/07 to 12/09.

ASSISTANT: Please provide your specifications.

USER: I need connecting flight.

ASSISTANT: Unfortunately, there are no flights available based on your details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.