You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am William Hall have to attend my important business meeting, can you help me to book a direct flight?

ASSISTANT: Yes, can I know your travelling airport codes?

USER: Sure, I want my ticket from SEA to IAD.

ASSISTANT: Ok, could you share me your travelling dates?

USER: Yes, my travel dates are 11/03 and 11/05.

ASSISTANT: Give me a moment.

USER: Ok.

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

USER: Ok, no issue I will search another way to complete my journey. Thanks for your information.

ASSISTANT: You are welcome.