You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, let me know travelling dates?

USER: My travelling dates are June 27 to June 29.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection of flight.

ASSISTANT: Is there any other specifications?

USER: I want to return in the morning.

ASSISTANT: May I know your good name?

USER: Brandon Walker here.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey routes.

USER: No problem, thank you.

ASSISTANT: Thank you for availing us.