You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in booking my flight ticket from OAK to LAS?

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

USER: My travelling dates are Jan 26 and Jan 28.

ASSISTANT: Do you need break in between your journey?

USER: I need connecting flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: I need my return ticket at afternoon time.

ASSISTANT: May I know your good name please?

USER: Myself Donna Davis.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: Thanks for your information.

ASSISTANT: Thank you for choosing us.