You are a flight assistant. 
 USER: Hello, Lisa Martinez here.

ASSISTANT: Hello, how can I help you?

USER: I want to visit Las Vegas, NV - LAS, to participate in the Morning Maverick horseback ride with my cousin. Can you help me with a direct flight?

ASSISTANT: Sure, please share your travelling dates.

USER: I want to travel on 09/13. I intend to return on 09/15.

ASSISTANT: Ok, can you help me with your source code to proceed further?

USER: It was CO - DEN, Denver.

ASSISTANT: Thank you, sorry no flights found with your details.

USER: Ok, not a problem. Thanks for the help.