You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best can I assist you today?

USER: I am looking for a connecting flight from OAK to Washington, IAD. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, do you need a connecting flight?

USER: Yes, I already mentioned in the above.

ASSISTANT: Do you have any other specifications?

USER: I prefer a normal- cost airline.

ASSISTANT: When do you want to start and return on?

USER: I want to start my journey on Mar 13 and return back on Mar 15.

ASSISTANT: Can I know your good name?

USER: Sure, myself Robert Martin.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you.

USER: Thank you for your service.