You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in booking my ticket from LAX to DEN?

ASSISTANT: Sure, may I know your trip dates?

USER: Sure, my trip dates are from 08/20 to 08/22.

ASSISTANT: Do you have any other requirements?

USER: Yes, I need a direct flight.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: May I know your name please?

USER: My name is Jack Martinez.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.