You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Stephanie Allen. Can you help me to book a flight with 200 price limit from OAK?

ASSISTANT: Sure, please share your travel dates.

USER: My travelling dates are 06/18 and 06/20.

ASSISTANT: Can I know your destination airport code?

USER: My preferred airport code is LAS.

ASSISTANT: I found a flight with 0 connection, is it ok for you?

USER: Sorry, I need a connecting flight.

ASSISTANT: Sorry, there is no flight available on your request.

USER: Ok, no issues.

ASSISTANT: That's fine.

USER: Thank you for your help.

ASSISTANT: You are welcome.