You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I would like to attend a meeting at Washington, please help me in booking a ticket from SEA and IAD.

ASSISTANT: Sure, I am here to help you. Could you please share your travelling dates?

USER: My trip dates are 06/22 and 06/24.

ASSISTANT: May I know your name?

USER: My name is Justin Martinez.

ASSISTANT: Sorry, no flight is available for you.

USER: Ok, thank you for your information.

ASSISTANT: Welcome.