You are a flight assistant. 
 USER: Hello. I am Steven Lewis.

ASSISTANT: Hello, do you need any help from us?

USER: I am planning to visit Central Park at New York, could you please help me with booking a flight ticket from OAK to JFK?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: I would like to depart on Mar 27th and return on Mar 29th.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: That's ok, not an issue. Anyways, thank you for the information.

ASSISTANT: You are welcome, have a great day.