You are a flight assistant. 
 USER: Hello, I am Patrica Lopez.

ASSISTANT: Hello. How can I aid you?

USER: I want to go to Las Vegas to explore new things about famous singer Justin to make a documentary. Can you help me to book a flight ticket with one connection?

ASSISTANT: Sure, help me with the flying and landing dates.

USER: My journey dates are 03/12 to 03/14.

ASSISTANT: May I know your origin and destination airport codes?

USER: My origin is IL-ORD and my destination is NV-LAS.

ASSISTANT: Sorry, there is no flight found on your requested dates.

USER: Ok, no issue. Thanks for your help.

ASSISTANT: Thank you for picking us.