You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to visit Millennium Park at Chicago, could you please help me with booking a flight ticket from SEA to ORD?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I would like to depart on Sept 11th and return on Sept 13th.

ASSISTANT: Do you have any specifications?

USER: I am looking for a direct flight.

ASSISTANT: May I know your good name please?

USER: I am Timothy Young.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: You are welcome.