You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kathleen Moore.

ASSISTANT: How may I assist you?

USER: I would like to attend a seminar at Dallas & Fort Worth, can you help me to book a flight ticket from OAK to DFW?

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

USER: I am travelling from Sept 02 to Sept 04.

ASSISTANT: Do you have any specifications?

USER: Please ensure the book a depart flight ticket at afternoon time.

ASSISTANT: Kathleen Moore, there are no flights available in your route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.