You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Elizabeth Roberts here. I want to meet my business partner to discuss about some issues in our casino. Could you help me to book my flight ticket?

ASSISTANT: Sure, May I know the travel dates?

USER: My itinerary dates are Aug 06 and Aug 08.

ASSISTANT: Please help me with your journey codes.

USER: My genesis and terminus airport codes are DEN and LAS.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for opting us.