You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I need a direct flight to reach Washington, so please help me in booking a flight ticket on Oct 12th.

ASSISTANT: Sure, I will help you with your request. Please help me with your date of arrival to Washington.

USER: My return date is Oct 14th.

ASSISTANT: May I know with your name please?

USER: My name is Jerry Brown.

ASSISTANT: Please help me with your departure airport code.

USER: My departure airport code is SEA.

ASSISTANT:  Please help me with your preference regarding the class.

USER: I usually prefer an economy class.

ASSISTANT: Just to confirm, may I know with your destination airport code?

USER: My destination airport code is IAD.

ASSISTANT: Thank you. Please let me know if you have any other preference in your journey.

USER: No, I don't have any other preference.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Thank you. Jerry Brown, I highly regret to inform you that there are no flights available for your journey.

USER: No worries, thank you.

ASSISTANT: Thank you for reaching us. Have a great time.