You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you today?

USER: I would like to book a flight ticket for a holiday trip,can you please help with this?

ASSISTANT: I am at your service? Can I have your journey details?

USER: Sure, my origin is from Oakland , CA - OAK on 12/29 to Washington, DC - IAD and return on 01/01.

ASSISTANT: Is there any other requirements for you?

USER: I have a price limit: 200 with single connection.

ASSISTANT: May I know your good name, please?

USER: I am Raymond Smith.

ASSISTANT: Thank you for waiting, but there are no flights as per your requirement.

USER: Ok, no issues.

ASSISTANT: Have a great day.

USER: Thank you, for your service.