You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Patricia Thomas here, can you please help me in booking the ticket from ATL to EWR? As I'm planning to visit New York.

ASSISTANT: Sure, I will help you. Can you please provide me your travel dates?

USER: Sure, my planned departure and return travel dates are 12/21 and 12/23.

ASSISTANT: Ok, please be online for a while.

USER: Sure, I'll wait for your response.

ASSISTANT: Sorry Thomas, there is no flight available on your preferred travel dates.

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

ASSISTANT: You are welcome and thank you for choosing us.