You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to visit Olympic National Park at Washington, could you please help me with booking a flight ticket from DEN to IAD?

ASSISTANT: Sure, may I know your planned trip dates?

USER: I would like to depart on Mar 7th and return on Mar 9th.

ASSISTANT: Is there any connection limit?

USER: I need a direct flight.

ASSISTANT: Which class do you prefer either economy or business?

USER: I prefer business class.

ASSISTANT: May I know your arrival and depart timings?

USER: I am ok with any timings.

ASSISTANT: Can you please share your good name?

USER: I am Emma Moore.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Thanks for your details, please be on hold.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights found on your specified routes.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for availing us.