You are a flight assistant. 
 USER: Hello, I am Betty Nelson.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to celebrate New Year with my friends at Austin, TX-AUS. can you please help me to book a flight ticket from Oakland, CA-OAK?

ASSISTANT: May I know your travel dates please?

USER: My travelling dates are from 01/01 to 01/03. My price limit is 5000.

ASSISTANT: Unfortunately there is no flight on your details.

USER: That's not a problem. Thanks for your information.

ASSISTANT: Thanks for choosing us.