You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I would like to travel in a direct flight. Could you please help me with booking a flight ticket?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Sure, my travelling dates are Nov 24 and Nov 26.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: My airport codes are IAD to SEA.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No.

ASSISTANT: Can you please provide your name to proceed further?

USER: I am Brenda Phillips.

ASSISTANT: Sorry, there are no flights available at your request.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for contacting us, have a nice day.