You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Laura Davis here. I would like to book a ticket from OAk to DCA, to attend a business meet.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travel dates are as follows Dec 08 and Dec 10.

ASSISTANT:  Which class do you prefer?

USER: No, I have none.

ASSISTANT: Do you have any particular time for departing and returning?

USER: Yes, I would like my return time in the morning and with a single connection flight.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: No problem. thank you for the information.

ASSISTANT: You are welcome.