You are a flight assistant. 
 USER: Hello. I am Gregory Wright.

ASSISTANT: Hello, how may I aid you?

USER: I need to book a ticket to meet my uncle and sister in New York after a long time. Could you please help me in doing that?

ASSISTANT: Sure, help me with your travelling codes.

USER: My travelling dates are 12/28 and return on 12/30.

ASSISTANT: Ok.

USER: My airport codes are LAS and EWR.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, there is no flights on your journey dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for availing us.