You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Is there any help that you are seeking from our side?

USER: Yes. I want to travel Oakland for giving a seminar to students about science and technology, can you please book a flight ticket from New York on 07/20?

ASSISTANT: That's great, I will help you with booking of flight ticket. Can you please provide me airport codes?

USER: I want to take off from JFK airport and my destination airport is OAK.

ASSISTANT: When would you like to return from OAK?

USER: I want return to New York on 07/22.

ASSISTANT: Ok, please give me a moment let me check for flight availability.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to inform you that no flight is available to you on your dates.

USER: It's ok no problem, I will go with another airline.

ASSISTANT: May I know your name for documentation purpose?

USER: My name is Joshua Wright. Thank you for your information.

ASSISTANT: Ok Joshua, thank you for reaching us.

USER: Welcome.