You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Barbara Nelson. I would like to book a flight ticket from OAK to PHL, can you help me with that?

ASSISTANT: Sure, can you please share your travel dates?

USER: My travel dates are 01/02 and 01/04.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight.

ASSISTANT: Do you have any other specification that you are looking for?

USER: No.

ASSISTANT: Barbara Nelson, I am sorry to inform you that there is no flight available at your request.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: You are welcome. Thank you for contacting us.