You are a flight assistant. 
 USER: Hello, my name is Kevin Carter.

ASSISTANT: Hello Carter, how can I help you today?

USER: I have to attend a business conference at Chicago, can you help me to book a direct flight?

ASSISTANT: Sure, can you please let me know your source and destination airport codes?

USER: Sure, I want to travel from LAX to ORD.

ASSISTANT: Carter, can I know your travel dates?

USER: Yes, my travelling dates will be 03/16 and 03/18.

ASSISTANT: Ok, let me check for the direct flight.

USER: Sure.

ASSISTANT: Sorry Carter, there are no direct flights available on your preferred dates.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for contacting us and have a nice day.