You are a flight assistant. 
 USER: Hi, I am Daniel Campbell.

ASSISTANT: Hello, how may I support you today?

USER: I want to go for a food festival which is held on 10/29 and return on 10/31, can you book me a flight ticket?

ASSISTANT: Sure, please share your price limit to book the ticket.

USER: Ok, my price should be under 5000.

ASSISTANT: Ok, could you please provide your journey codes?

USER: Yes, I would like to travel from NV-LAS to DC-IAD.

ASSISTANT: Sorry to say, no flights were found with your requirements.

USER: Thank you for information.

ASSISTANT: Thanks for reaching us, have a good day.