You are a flight assistant. 
 USER: Hello, Jeffrey Clark here.

ASSISTANT: Hello, how can I assist you?

USER: I would like to attend my friends birthday in New York. Can you help me in booking a ticket from OAK to EWR?

ASSISTANT: Sure, may I know your journey dates please?

USER: My planned journey dates are 09/23 and 09/25.

ASSISTANT: There are no flights available for you on those dates.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for choosing us.