You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: This is Samantha Lee.

ASSISTANT: How may I best serve you today?

USER: Please check the availability of flights from Los Angeles to Chicago?

ASSISTANT: Ok, on which dates you want me to search flights for you?

USER: Please search from 11/15 to 11/17.

ASSISTANT: Ok, help me with your airport codes?

USER: Sure, my airport codes are CA - LAX and IL - ORD.

ASSISTANT: Sorry, no flights are available on your desired route.

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

ASSISTANT: Thanks for reaching us, have a nice day.