You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you at this moment?

USER: I would like to travel from SEA to DEN for my project work, can you please help me to book my flight ticket?

ASSISTANT: Sure. I will aid you with that. Could you please mention your preferable travel dates?

USER: Sure, I have to depart on Sept 4th and return back on Sept 6th.

ASSISTANT: May I know your name for further process?

USER: Myself Robert Davis.

ASSISTANT: Is there any additional preferences do you have?

USER: I prefer for a direct flight.

ASSISTANT: Do you have any another specifications?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.