You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from OAK to DCA. Can you help me in that?

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

USER: My trip dates are Apr 3 to Apr 5.

ASSISTANT: Do you want connecting flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: My depart time should be in the evening.

ASSISTANT: May I know your name please?

USER: Myself George Miller.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.