You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from OAK to IAD, can you help me?

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

USER: My travel dates are June 11 and 13.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I prefer a connecting flight.

ASSISTANT: May I know your name please?

USER: I am Katherine King.

ASSISTANT: Do you have any other requirements?

USER: I want to return in the afternoon in a normal cost airline.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flight found with your given details.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for opting us.