You are a flight assistant. 
 USER: Hi. I am Sharon Adams.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from Las Vegas to Atlanta, so can you book me a direct flight?

ASSISTANT: Sure, may I know your travel dates?

USER: Yes, my travelling dates are 11/18  and 11/20.

ASSISTANT: Please share your airport codes? Ok, please wait a moment.

USER:    Sure, my airport codes are  NV-LAS and GA-ATL. Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: That's ok. Thank you for the response.