You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking a flight ticket to OAK from IAD?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, my journey dates are May 10 and May 12.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight which return from my destination in the afternoon.

ASSISTANT: Can I have your name to proceed?

USER: Sure, my name is Joseph Rodriguez.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

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

ASSISTANT: Thank you for choosing us.