You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy Brown here.

ASSISTANT: How can I help you at this moment?

USER: I would like to book a flight ticket from SEA to IAD. Could you please help me with that flight ticket booking?

ASSISTANT: Sure, I can help you in booking flight ticket. Could you please mention your preferable travel dates for booking flight ticket?

USER: My travelling dates are from 10/26 to 10/28.

ASSISTANT: Thank you for providing your travel details, please wait a moment, I will check flight availability in this route.

USER: Sure, I will wait for your information.

ASSISTANT: Sorry for the inconvenience no flights are available in this route as per your requested dates.

USER: Ok, no problem. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day Nancy Brown.