You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Brian Carter. I am planning to visit Seattle, will you help me in booking the flight ticket from ORD to SEA?

ASSISTANT: Sure, may I know your trip dates please?

USER: My preferable journey dates are Dec 24 and Dec 26.

ASSISTANT: Ok, do you have any other requirements?

USER: I need a flight with single connection which arrives at afternoon time.

ASSISTANT: Ok, please wait for a while. Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: My pleasure.