You are a flight assistant. 
 USER: Hello, I am Brenda Clark.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to attend a sports live event in Las Vegas NV - LAS, could you please help me in booking a flight ticket from NY - EWR?

ASSISTANT: Sure, can you please share your journey dates?

USER: I would like to fly on 12/19 and return on 12/21.

ASSISTANT: Do you need any other requirements?

USER: I need a direct flight.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights found on your given dates.

USER: Not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you.