You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I planned to attend for a meeting in BOS, can you please help me to book a flight ticket from OAK?

ASSISTANT: Sure, I am  happy to help you with that. Can I have your travel dates please?

USER: I prefer to travel on Nov 11 and Nov 13.

ASSISTANT: Ok, please let me know the timings of your journey.

USER: I am comfortable at any time.

ASSISTANT: Do you prefer any specific class to travel?

USER: No.

ASSISTANT: Can I have your good name please to proceed further?

USER: I am Shirley Thompson.

ASSISTANT: Do you have any other specifications?

USER: No.

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

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.