You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. HOw may I aid you?

USER: I am Kevin Phillips. I am trying to book a flight ticket from SEA on 12/07. Can you please check the flight?

ASSISTANT: Sure, I will help you out in booking the ticket.

USER: Thank you.

ASSISTANT: May I know your return journey details please?

USER: My destination airport code is DCA and  the return date is 12/09.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I can wait for your response.

ASSISTANT: Sorry, there are no flights found.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.