You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sarah Lopez here.

ASSISTANT: How may I aid you?

USER: I'm planning to attend a conference, can you book a ticket from LAX to ATL?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: Sure, my planned departure and return travel dates are 17th and 19th of April.

ASSISTANT: May I know your departure time and arrival time?

USER: Yes, I want to return in the evening time.

ASSISTANT: Do you have any other requirements?

USER: No, I don't have.

ASSISTANT: Sorry, no flight is available for you as per your requests.

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

ASSISTANT: Thank you.