You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Please let me know, What kind of service you are looking for today?

USER: Could you please book a flight ticket from SEA to DCA?

ASSISTANT: Sure, I can help you to make your journey successful.

USER: Thank you.

ASSISTANT: Let me know when you are willing to travel to book a flight?

USER: I want to travel on June 11 and return on June 13.

ASSISTANT: Which flight you have preferred to travel either a connecting flight or a direct flight?

USER: I need a direct flight.

ASSISTANT:  If you can help me with your name, I can begin looking up for the availability of flights.

USER: Sure, Sandra Edwards is my name.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: I don't have any other specifications.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us, hope to serve you better next time.