You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me to reserve a flight ticket from OAK to PHX?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My travelling dates are 17 and 19 of Dec.

ASSISTANT: May I know your class and airline name please?

USER: I don't have any specification except connecting flight.

ASSISTANT: Can I have your good name please?

USER: I am Amanda Williams.

ASSISTANT: Sorry, there are no flights available for you on those dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.