You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Katherine Harris. I have to attend a Live Concert at Oakland, could you please help me with booking a flight ticket from JFK to OAK?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I would like to depart on Mar 28th and return on Mar 30th.

ASSISTANT: Please wait for a moment.

USER: Make sure that my return time is evening.

ASSISTANT: Sorry to say, no flight is available for you.

USER: Ok, I will find an another alternate way to complete my trip.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.