You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Brenda Carter here. Please help me out in booking the ticket from SEA to IAD.

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: My trip dates will be Oct 4 to Oct 6.

ASSISTANT: Ok, please let me know your preference regarding timings of your journey.

USER: My return time must be in the evening.

ASSISTANT: That is fine, if you have any limits about connections still I am ready to accept now. So let me know them.

USER: Yes, I need a direct flight.

ASSISTANT: Ok Brenda Carter, I am ready to provide you the flight details once I have checked in website.

USER: Ok.

ASSISTANT: Sorry Brenda Carter, no direct flight is available to you on your dates.

USER: That's ok, thank you for informing.

ASSISTANT: Thank you for choosing us, have a good day.