You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hello.

ASSISTANT: How may I assist you today?

USER: I am planning to visit Seattle, will you help me in booking the flight ticket from IAD to SEA?

ASSISTANT: Sure, I will help you. Please help me with your planned travel dates.

USER: My travelling dates are Oct 30 and Nov 01.

ASSISTANT: Please let me know with the name on which the ticket has to be booked.

USER: Myself Barbara Scott.

ASSISTANT: Do you need a direct or connecting flight?

USER: I am comfortable with any connection.

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

USER: I always prefer business class.

ASSISTANT: May I know if you have any other preferences ?

USER: No, thank you for asking.

ASSISTANT: Barbara Scott, I am really sorry to inform you that there are no flights available for your journey.

USER: Ok, not an issue. Thank you for your information.

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