You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I help you?

USER: I am Brenda Harris. I want to book a ticket to Oakland,  CA - OAK can you please give me assistance on this.

ASSISTANT: Thank you, for providing us your travel details. May I know your travel dates and source airport code?

USER: Sure, my travelling dates are on 01/01 to 01/03 from Washington DC - IAD .

ASSISTANT: Thank you for waiting.

USER: I have price limit :500 with connection 1. can you please check the availability of my request.

ASSISTANT: We are sorry to inform you that there are no flights available on your travel dates.

USER: OK,.

ASSISTANT: Thank you for spending your valuable time with us regarding booking information.

USER: Thank you, for your help and support.