You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Stephen Allen, I want to book a ticket from LAX to DEN. Can you find a direct flight?

ASSISTANT: Sure, can you please share your dates of travelling?

USER: Travelling dates are on 09/19 and 09/21.

ASSISTANT: Do you have any other specifications to be met?

USER: My price limit is 500.

ASSISTANT: Ok, please wait a moment. Thank you for your time, sorry, no flight found on that route.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for availing us.