You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: John Parker here.

ASSISTANT: In which way I can help you today?

USER: I would like to attend a business conference in Washington, can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure, I can help you in booking flight ticket.

USER: Thank you.

ASSISTANT: Could you please mention your travel dates for booking flight ticket?

USER: I am planning to move on 10/27 and please book my return ticket on 10/29.

ASSISTANT: May I know your preferable airport code names for further process?

USER: I will prefer EWR and DCA as my origin and destination airport codes.

ASSISTANT: Please hold on a moment, I will check flight availability in this route.

USER: Sure, take your time but try to bring a direct flight to my journey.

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

USER: Oh! So sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us, have a good day.