You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Gregory Edwards here.

ASSISTANT: How may I help you?

USER: Please help me out in booking the ticket from DCA to SEA.

ASSISTANT: Sure, I can do that for you. Can you please let me know your trip dates?

USER: My trip dates will be Jan 26 to Jan 28.

ASSISTANT: Ok, do you have any specifications?

USER: I want direct flight and return time must be in the afternoon.

ASSISTANT: Ok, please be on hold for a while.

USER: Ok.

ASSISTANT: Sorry, there is no direct flight available as per your requirements.

USER: That's ok. Thank you.

ASSISTANT: You are welcome and have a nice day.