You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name please?

USER: I am Pamela Martinez.

ASSISTANT: Yes Pamela, how can I help you with?

USER: I am planning for a vacation in OAK.Can you please help me to book the flight ticket on 10/20 and 10/22?

ASSISTANT: Can I have your origin airport code please?

USER: My origin airport code is JFK.

ASSISTANT: Sure, please wait for a moment. Sorry, no flight is available regarding your vacation.

USER: That's ok. Thank you for the help.

ASSISTANT: Thank you and have a nice day.