You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Ryan Davis. I am a traveler and would like to explore the new places in Chicago, so I need to book a flight ticket. Can you please aid me in making a plane reservation?

ASSISTANT: Sure, May I know the travel dates?

USER: My depart is on 09/10. I intend to arrive on 09/12.

ASSISTANT: Please help me with your journey codes.

USER: My journey codes are from NV-LAS to IL-ORD.

ASSISTANT: Please wait a minute.

USER: Sure, I will be waiting.

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

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

ASSISTANT: Thank you for opting us.