You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit Oakland, Please help me in booking a ticket from IAD to OAK.

ASSISTANT: Sure, when would you like to depart and return?

USER: My planned travel dates are on Apr 06 and Apr 08.

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Stephanie Brown.

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

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting us.