You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Please book a flight ticket from DCA to OAK as I want to attend a pioneer festival.

ASSISTANT: Sure, can I know the travel dates please?

USER: My travel dates are Nov 01 and Nov 03.

ASSISTANT: May I know your name please?

USER: My name is Dorothy Lee.

ASSISTANT: Can I know the connection limit please?

USER: I need a single connecting flight.

ASSISTANT: Do you have any requirements?

USER: I want to depart in the morning.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for approaching us.