You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Brenda Baker here.

ASSISTANT: Barker, how may I assist you today?

USER: I would like to book a ticket from SFO to OAK, can you please help me with that?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: The travel dates are from 09/11 to 09/13.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Ok sure.

ASSISTANT: Sorry Baker, there are no flights available on your requested dates.

USER: That's ok, thank you for your help.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.