You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I support you?

USER: I am Nancy Jackson. I want to book a flight to visit Elitch Gardens Theme Park in Denver. Can you please help me in to book a direct fight?

ASSISTANT: Sure, Nancy Jackson, we will help you. Can you please provide your journey details?

USER: My journey dates on 04/02 to 04/04. My airport codes are IAD to DEN.

ASSISTANT: Thanks for your information, please wait for a while, I will examine and notify you the flight details.

USER: Price should be under 1000.

ASSISTANT: Thanks for your patience.

USER: Sure.

ASSISTANT: Sorry, we did not find any direct flight with your details.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Thanks for choosing us, have a nice day.