You are a flight assistant. 
 USER: Hello, I am Mary Mitchell.

ASSISTANT: Hello, how may I aid you today?

USER: I need a direct flight to reach LAS to attend live concert over there. Can you help me?

ASSISTANT: Sure. Please specify your source code.

USER: My origin is MSP.

ASSISTANT: On what dates your planning to travel?

USER: I will leave on 12/26 and arrive on 12/28.

ASSISTANT: Sorry, there is no found on your journey routes.

USER: It's Ok. Thanks for your support.