You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: I want to book a flight ticket to attend an cultural event  from CA. Can you help me?

ASSISTANT: Sure, May I know the travelling dates?

USER: Apr 02nd and 04th are my travelling dates.

ASSISTANT: Please help me with your journey codes.

USER: OAK and DCA are my airport codes.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Is there any other requirements?

USER: I would like to return in the morning.

ASSISTANT: May I know your name?

USER: Jack Miller here.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No issue. Thank you.

ASSISTANT: Thank you for opting us.